v2.4.1.9

EMPLOYEE BENEFIT PLANS (Details)	12 Months Ended																12 Months Ended																12 Months Ended																																																																	12 Months Ended														12 Months Ended
	Mar. 31, 2015 USD ($) Objectives Employee	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Mar. 31, 2015 Employee Stock Option [Member] USD ($)	Mar. 31, 2014 Employee Stock Option [Member] USD ($)	Mar. 31, 2013 Employee Stock Option [Member] USD ($)	Mar. 31, 2015 Restricted Stock And Restricted Stock Units [Member] USD ($)	Mar. 31, 2014 Restricted Stock And Restricted Stock Units [Member] USD ($)	Mar. 31, 2013 Restricted Stock And Restricted Stock Units [Member] USD ($)	Mar. 31, 2015 Performance Cash [Member] USD ($)	Mar. 31, 2014 Performance Cash [Member] USD ($)	Mar. 31, 2013 Performance Cash [Member] USD ($)	Mar. 31, 2015 Performance Cash [Member] Maximum [Member]	Mar. 31, 2015 Performance Cash [Member] Minimum [Member]	Mar. 31, 2015 Plan 2007 [Member]	May 14, 2013 Plan 2007 [Member]	Mar. 31, 2015 Plan 2007 [Member] Employee Stock Option [Member] USD ($)	Mar. 31, 2014 Plan 2007 [Member] Employee Stock Option [Member] USD ($)	Mar. 31, 2013 Plan 2007 [Member] Employee Stock Option [Member] USD ($)	Mar. 31, 2015 Plan 2004 [Member] Employee Stock Option [Member]	Mar. 31, 2015 Plan 2003 [Member] Non-employee directors [Member]	Mar. 31, 2015 Plan 2003 [Member] Employee Stock Option [Member] Non-employee directors [Member]	Mar. 31, 2015 Original Terms [Member]	Mar. 31, 2015 First Amendment [Member]	Mar. 31, 2015 Share-based Compensation Award, Tranche One [Member] Employee Stock Option [Member]	Mar. 31, 2015 Share-based Compensation Award, Tranche Two [Member] Employee Stock Option [Member]	Mar. 31, 2015 Share-based Compensation Award, Tranche Three [Member] Employee Stock Option [Member]	Mar. 31, 2015 Retirement Agreement [Member] Chief Executive Officer [Member] USD ($)	Mar. 31, 2015 Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2015 Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2015 Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2015 Equity Securities [Member]	Mar. 31, 2014 Equity Securities [Member]	Mar. 31, 2015 Debt Securities [Member]	Mar. 31, 2014 Debt Securities [Member]	Mar. 31, 2015 Real Estate [Member]	Mar. 31, 2014 Real Estate [Member]	Mar. 31, 2015 Other Plan Assets [Member]	Mar. 31, 2014 Other Plan Assets [Member]	Mar. 31, 2015 Cash and cash equivalents [Member] USD ($)	Mar. 31, 2014 Cash and cash equivalents [Member] USD ($)	Mar. 31, 2015 Cash and cash equivalents [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Cash and cash equivalents [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2015 Cash and cash equivalents [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Cash and cash equivalents [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2015 Cash and cash equivalents [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Cash and cash equivalents [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2015 Equity Investments UK [Member] USD ($)	Mar. 31, 2014 Equity Investments UK [Member] USD ($)	Mar. 31, 2015 Equity Investments UK [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Equity Investments UK [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2015 Equity Investments UK [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Equity Investments UK [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2015 Equity Investments UK [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Equity Investments UK [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2015 Equity Investments Non UK [Member] USD ($)	Mar. 31, 2014 Equity Investments Non UK [Member] USD ($)	Mar. 31, 2015 Equity Investments Non UK [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Equity Investments Non UK [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2015 Equity Investments Non UK [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Equity Investments Non UK [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2015 Equity Investments Non UK [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Equity Investments Non UK [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2015 Diviersified Growth Funds [Member] USD ($)	Mar. 31, 2014 Diviersified Growth Funds [Member] USD ($)	Mar. 31, 2015 Diviersified Growth Funds [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Diviersified Growth Funds [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2015 Diviersified Growth Funds [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Diviersified Growth Funds [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2015 Diviersified Growth Funds [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Diviersified Growth Funds [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2015 Government debt securities [Member] USD ($)	Mar. 31, 2014 Government debt securities [Member] USD ($)	Mar. 31, 2015 Government debt securities [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Government debt securities [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2015 Government debt securities [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Government debt securities [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2015 Government debt securities [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Government debt securities [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2015 Corporate Debt Securities [Member] USD ($)	Mar. 31, 2014 Corporate Debt Securities [Member] USD ($)	Mar. 31, 2015 Corporate Debt Securities [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Corporate Debt Securities [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2015 Corporate Debt Securities [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Corporate Debt Securities [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2015 Corporate Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Corporate Debt Securities [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2015 Group Insurance Policies [Member] USD ($)	Mar. 31, 2014 Group Insurance Policies [Member] USD ($)	Mar. 31, 2015 Group Insurance Policies [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Group Insurance Policies [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2015 Group Insurance Policies [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Group Insurance Policies [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2015 Group Insurance Policies [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Group Insurance Policies [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2015 UK Pension Plan [Member]	Mar. 31, 2015 UK Pension Plan [Member] Plans	Mar. 31, 2015 Pension Plan [Member] UK Pension Plan [Member] USD ($) Plans	Mar. 31, 2015 Pension Plan [Member] UK Pension Plan [Member] GBP (£)	Mar. 31, 2014 Pension Plan [Member] UK Pension Plan [Member]	Mar. 31, 2013 Pension Plan [Member] UK Pension Plan [Member]	Mar. 31, 2015 Pension Plan [Member] UK Pension Plan [Member] Pilot [Member]	Mar. 31, 2015 Pension Plan [Member] UK Pension Plan [Member] Other employee [Member]	Mar. 31, 2015 Pension Plan [Member] Norway pension plan [Member]	Mar. 31, 2014 Pension Plan [Member] Norway pension plan [Member]	Mar. 31, 2013 Pension Plan [Member] Norway pension plan [Member]	Mar. 31, 2015 Pension Plan [Member] Norway pension plan [Member] Pilot [Member] Age	Mar. 31, 2015 Pension Plan [Member] Norway pension plan [Member] Other employee [Member] Age	Mar. 31, 2015 Pension Plan [Member] Norway pension plan [Member] Minimum [Member] Age	Mar. 31, 2016 Scenario, Forecast [Member] USD ($)	Mar. 31, 2016 Scenario, Forecast [Member] Pension Plan [Member] UK Pension Plan [Member] USD ($)	Mar. 31, 2016 Scenario, Forecast [Member] Pension Plan [Member] Norway pension plan [Member] USD ($)	Mar. 31, 2015 Fair Value, Measurements, Recurring [Member] USD ($)	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] USD ($)	Mar. 31, 2015 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] USD ($)	Mar. 31, 2015 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] USD ($)	Mar. 31, 2015 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] USD ($)	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] USD ($)
Compensation Related Costs [Line Items]
Defined Contribution Pension Match	3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Defined Contribution Pension	3.00%brs_DefinedContributionPension
Defined Contribution Amount	$ 15,200,000us-gaap_DefinedContributionPlanCostRecognized	$ 12,700,000us-gaap_DefinedContributionPlanCostRecognized	$ 10,900,000us-gaap_DefinedContributionPlanCostRecognized
Annual Rate Increase Limit																																																																																																		5.00%brs_AnnualRateIncreaseLimit / brs_DefinedBenefitPlanNameAxis = brs_UkPensionPlanMember
Number of original closed defined benefit pension plans																																																																																																				2brs_NumberOfOriginalClosedDefinedBenefitPensionPlans / brs_DefinedBenefitPlanNameAxis = brs_UkPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	2brs_NumberOfOriginalClosedDefinedBenefitPensionPlans / brs_DefinedBenefitPlanNameAxis = brs_UkPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Closed Plan Maximum Contribution																																																																																																								7.35%brs_ClosedPlanMaximumContribution / brs_DefinedBenefitPlanNameAxis = brs_UkPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_TitleOfIndividualAxis = brs_PilotMember	7.00%brs_ClosedPlanMaximumContribution / brs_DefinedBenefitPlanNameAxis = brs_UkPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_TitleOfIndividualAxis = brs_OtherEmployeeMember
Minimum Contribution Match																																																																																																				5.00%brs_MinimumContributionMatch / brs_DefinedBenefitPlanNameAxis = brs_UkPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	5.00%brs_MinimumContributionMatch / brs_DefinedBenefitPlanNameAxis = brs_UkPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Number Of Other Defined Contribution Plans																																																																																																			3brs_NumberOfOtherDefinedContributionPlans / us-gaap_DefinedContributionPlanNameAxis = brs_UkPensionPlanMember
Number Of Other Defined Contribution Plans Closed To New Members																																																																																																			2brs_NumberOfOtherDefinedContributionPlansClosedToNewMembers / us-gaap_DefinedContributionPlanNameAxis = brs_UkPensionPlanMember
Retirement Age																																																																																																													58brs_RetirementAge / brs_DefinedBenefitPlanNameAxis = brs_NorwayPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_TitleOfIndividualAxis = brs_PilotMember	62brs_RetirementAge / brs_DefinedBenefitPlanNameAxis = brs_NorwayPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_TitleOfIndividualAxis = brs_OtherEmployeeMember
Years of Service For Maximum Pension																																																																																																															30brs_YearsOfServiceForMaximumPension / brs_DefinedBenefitPlanNameAxis = brs_NorwayPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Change in Benefit Obligation
Projected benefit obligation (PBO)- beginning balance	637,641,000us-gaap_DefinedBenefitPlanBenefitObligation	606,313,000us-gaap_DefinedBenefitPlanBenefitObligation
Service cost for benefits earned during the period	7,878,000us-gaap_DefinedBenefitPlanServiceCost	7,886,000us-gaap_DefinedBenefitPlanServiceCost	8,209,000us-gaap_DefinedBenefitPlanServiceCost
Interest cost on PBO	26,000,000us-gaap_DefinedBenefitPlanInterestCost	26,861,000us-gaap_DefinedBenefitPlanInterestCost	25,683,000us-gaap_DefinedBenefitPlanInterestCost
Actuarial loss	86,940,000us-gaap_DefinedBenefitPlanActuarialGainLoss	(29,313,000)us-gaap_DefinedBenefitPlanActuarialGainLoss
Benefit payments and expenses	(28,191,000)us-gaap_DefinedBenefitPlanBenefitsPaid	(23,234,000)us-gaap_DefinedBenefitPlanBenefitsPaid
Effect of exchange rate changes	(90,969,000)us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation	49,128,000us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation
Projected benefit obligation (PBO)- ending balance	639,299,000us-gaap_DefinedBenefitPlanBenefitObligation	637,641,000us-gaap_DefinedBenefitPlanBenefitObligation	606,313,000us-gaap_DefinedBenefitPlanBenefitObligation
Change in Plan Assets
Market value of assets - beginning balance	550,818,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets	479,666,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets																											13,657,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	48,685,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	470,139,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	440,835,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	61,298,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member									13,657,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember	48,685,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember	13,657,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	48,685,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	104,953,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_EquityInvestmentsUkMember	118,712,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_EquityInvestmentsUkMember	0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_EquityInvestmentsUkMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_EquityInvestmentsUkMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	104,953,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_EquityInvestmentsUkMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	118,712,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_EquityInvestmentsUkMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_EquityInvestmentsUkMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_EquityInvestmentsUkMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	98,867,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_EquityInvestmentsNonUkMember	96,537,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_EquityInvestmentsNonUkMember	0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_EquityInvestmentsNonUkMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_EquityInvestmentsNonUkMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	98,867,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_EquityInvestmentsNonUkMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	96,537,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_EquityInvestmentsNonUkMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_EquityInvestmentsNonUkMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_EquityInvestmentsNonUkMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	101,242,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_DiviersifiedGrowthFundsMember	105,207,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_DiviersifiedGrowthFundsMember	0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_DiviersifiedGrowthFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_DiviersifiedGrowthFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	101,242,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_DiviersifiedGrowthFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	105,207,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_DiviersifiedGrowthFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_DiviersifiedGrowthFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_DiviersifiedGrowthFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member	71,998,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_GovernmentDebtSecuritiesMember	51,853,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_GovernmentDebtSecuritiesMember	0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_GovernmentDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_GovernmentDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member	71,998,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_GovernmentDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member	51,853,000us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_GovernmentDebtSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = 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Benefit payments and expenses	(28,191,000)us-gaap_DefinedBenefitPlanBenefitsPaid	(23,234,000)us-gaap_DefinedBenefitPlanBenefitsPaid
Effect of exchange rate changes on plan assets	(75,228,000)us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesPlanAssets	41,782,000us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesPlanAssets																															17,796,000us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
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us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_GroupPoliciesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Accumulated benefit obligation (ABO)	615,136,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation	611,782,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
Projected benefit obligation (PBO)	639,299,000us-gaap_DefinedBenefitPlanBenefitObligation	637,641,000us-gaap_DefinedBenefitPlanBenefitObligation	606,313,000us-gaap_DefinedBenefitPlanBenefitObligation
Net recognized pension liability	99,576,000us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent	86,823,000us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent
Amounts recognized in accumulated other comprehensive loss	252,920,000us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax	232,848,000us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
Components of net periodic pension cost
Service cost for benefits earned during the period	7,878,000us-gaap_DefinedBenefitPlanServiceCost	7,886,000us-gaap_DefinedBenefitPlanServiceCost	8,209,000us-gaap_DefinedBenefitPlanServiceCost
Interest cost on PBO	26,000,000us-gaap_DefinedBenefitPlanInterestCost	26,861,000us-gaap_DefinedBenefitPlanInterestCost	25,683,000us-gaap_DefinedBenefitPlanInterestCost
Expected return on assets	(31,020,000)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets	(29,282,000)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets	(29,068,000)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
Amortization of unrecognized losses	6,653,000us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses	7,705,000us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses	6,612,000us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
Net periodic pension cost	9,511,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost	13,170,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost	11,436,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
Amount in Accumulated OCI expected to be recognized in following fiscal year	7,100,000us-gaap_DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear
Assumptions Used [Abstract]
Discount rate																																																																																																				4.40%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate / brs_DefinedBenefitPlanNameAxis = brs_UkPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	4.40%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate / brs_DefinedBenefitPlanNameAxis = brs_UkPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	4.40%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate / brs_DefinedBenefitPlanNameAxis = brs_UkPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	4.90%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate / brs_DefinedBenefitPlanNameAxis = brs_UkPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember			4.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate / brs_DefinedBenefitPlanNameAxis = brs_NorwayPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	4.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate / brs_DefinedBenefitPlanNameAxis = brs_NorwayPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	3.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate / brs_DefinedBenefitPlanNameAxis = brs_NorwayPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Rate of compensation increase																																																																																																										4.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease / brs_DefinedBenefitPlanNameAxis = brs_NorwayPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	4.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease / brs_DefinedBenefitPlanNameAxis = brs_NorwayPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	4.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease / brs_DefinedBenefitPlanNameAxis = brs_NorwayPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Social security increase amount																																																																																																										3.75%brs_SocialSecurityBaseRate / brs_DefinedBenefitPlanNameAxis = brs_NorwayPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	4.00%brs_SocialSecurityBaseRate / brs_DefinedBenefitPlanNameAxis = brs_NorwayPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	4.00%brs_SocialSecurityBaseRate / brs_DefinedBenefitPlanNameAxis = brs_NorwayPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Expected return on plan assets																																																																																																				6.29%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets / brs_DefinedBenefitPlanNameAxis = brs_UkPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	6.29%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets / brs_DefinedBenefitPlanNameAxis = brs_UkPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	6.29%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets / brs_DefinedBenefitPlanNameAxis = brs_UkPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	6.90%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets / brs_DefinedBenefitPlanNameAxis = brs_UkPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember			2.75%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets / brs_DefinedBenefitPlanNameAxis = brs_NorwayPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	3.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets / brs_DefinedBenefitPlanNameAxis = brs_NorwayPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	4.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets / brs_DefinedBenefitPlanNameAxis = brs_NorwayPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Pension increase rate																																																																																																				3.10%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease / brs_DefinedBenefitPlanNameAxis = brs_UkPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	3.10%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease / brs_DefinedBenefitPlanNameAxis = brs_UkPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	3.30%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease / brs_DefinedBenefitPlanNameAxis = brs_UkPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	3.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease / brs_DefinedBenefitPlanNameAxis = brs_UkPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember			1.75%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease / brs_DefinedBenefitPlanNameAxis = brs_NorwayPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	1.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease / brs_DefinedBenefitPlanNameAxis = brs_NorwayPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember	0.75%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease / brs_DefinedBenefitPlanNameAxis = brs_NorwayPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Pension Plan Investment Strategy, Number Of Objectives	3brs_PensionPlanInvestmentStrategyNumberOfObjectives
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Actual allocation of plan assets	100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations	100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations																																57.10%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember	59.10%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember	35.80%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember	27.60%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember	1.60%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember	1.50%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember	5.50%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_OtherPlanAssetsMember	11.80%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_OtherPlanAssetsMember
Target allocation of plan assets	100.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations	100.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations																																58.30%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember	57.80%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquitySecuritiesMember	31.10%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember	30.80%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_DebtSecuritiesMember	0.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember	0.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember	10.60%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_OtherPlanAssetsMember	11.40%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = brs_OtherPlanAssetsMember
Estimated cash contributions																																																																																																																	18,100,000us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear / brs_DefinedBenefitPlanNameAxis = brs_UkPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember	11,700,000us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear / brs_DefinedBenefitPlanNameAxis = brs_NorwayPensionPlanMember / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
Net purchases, sales and settlements																																	11,341,000us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Projected benefit payments by year [Abstract]
2016	25,417,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
2017	26,222,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
2018	26,736,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
2019	27,548,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
2020	28,214,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
Aggregate 2021 - 2024	151,155,000us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
Share-based Compensation [Abstract]
Common Stock Shares reserved	4,133,008us-gaap_CommonStockCapitalSharesReservedForFutureIssuance														5,400,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = brs_Plan2007Member	2,400,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = brs_Plan2007Member					250,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_PlanNameAxis = brs_Plan2003Member / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	2,377,643us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures																					5,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = brs_Plan2003Member / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period																	10 years			10 years		10 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage																									33.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheOneMember	33.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheTwoMember	33.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_VestingAxis = us-gaap_ShareBasedCompensationAwardTrancheThreeMember
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period				3 years			3 years			3 years												6 months
Cash Based Performance Compensation Arrangement By Cash Based Payment Award Percentage Of Target Amount													200.00%brs_CashBasedPerformanceCompensationArrangementByCashBasedPaymentAwardPercentageOfTargetAmount / us-gaap_AwardTypeAxis = brs_PerformanceCashMember / us-gaap_RangeAxis = us-gaap_MaximumMember	0.00%brs_CashBasedPerformanceCompensationArrangementByCashBasedPaymentAwardPercentageOfTargetAmount / us-gaap_AwardTypeAxis = brs_PerformanceCashMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Performance Cash Max Payout										15,900,000brs_PerformanceCashMaxPayout / us-gaap_AwardTypeAxis = brs_PerformanceCashMember	13,200,000brs_PerformanceCashMaxPayout / us-gaap_AwardTypeAxis = brs_PerformanceCashMember	8,800,000brs_PerformanceCashMaxPayout / us-gaap_AwardTypeAxis = brs_PerformanceCashMember
Performance Cash Compensation Expense										14,100,000brs_PerformanceCashCompensationExpense / us-gaap_AwardTypeAxis = brs_PerformanceCashMember	8,700,000brs_PerformanceCashCompensationExpense / us-gaap_AwardTypeAxis = brs_PerformanceCashMember	10,200,000brs_PerformanceCashCompensationExpense / us-gaap_AwardTypeAxis = brs_PerformanceCashMember
Share-Based Compensation Arrangement By Share-Based Payment Award, Retirement Terms, Years Of Service																							5 years
Share-Based Compensation Arrangement By Share-Based Payment Award, Retirement Terms, Retirement Age																							62 years
Share-Based Compensation Arrangement By Share-Based Payment Award, Retirement Terms, Years Of Service and Retirement Age																								80 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, Outstanding, Weighted Average Exercise Price, Beginning balance	$ 48.62us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Options, Grants in Period, Weighted Average Exercise Price	$ 74.44us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice																$ 74.37us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = brs_Plan2007Member	$ 62.66us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = brs_Plan2007Member	$ 43.38us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_PlanNameAxis = brs_Plan2007Member
Options, Exercises in Period, Weighted Average Exercise Price	$ 45.31us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	$ 35.51us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 61.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice
Options, Outstanding, Weighted Average Price, Ending balance	$ 57.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	$ 48.62us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Options, Exercisable, Weighted Average Exercise Price	$ 46.68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Options, Outstanding, Number, Beginning Balance	1,002,156us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options, Grants in Period, Gross	472,744us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Options, Exercises in Period	114,145us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised	433,608us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Options, Forfeitures and Expirations in Period	24,619us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod
Options, Outstanding, Number, Ending Balance	1,336,136us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1,002,156us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Options, Exercisable, Number	673,784us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Options, Exercisable, Weighted Average Remaining Contractual Term	7 years 3 months 26 days
Options, Outstanding, Weighted Average Remaining Contractual Term	5 years 10 months 15 days
Options, Outstanding, Intrinsic Value	6,410,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Options, Exercisable, Intrinsic Value	7,118,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Fair Value Assumptions, Risk Free Interest Rate				1.67%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	1.01%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	0.80%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Fair Value Assumptions, Expected Term				5 years	5 years	5 years
Fair Value Assumptions, Expected Volatility Rate				30.10%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	48.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	50.20%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Fair Value Assumptions, Expected Dividend Rate				2.06%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	1.60%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	1.83%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Weighted Average Grant Date Fair Value				$ 17.17us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 23.77us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	$ 16.73us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized				8,200,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember			12,200,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = brs_RestrictedStockAndRestrictedStockUnitsMember
Share-based Compensation, Nonvested Awards, Number Of Shares				662,352brs_EmployeeServiceShareBasedCompensationNonvestedAwardsNumberOfShares / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember			419,229brs_EmployeeServiceShareBasedCompensationNonvestedAwardsNumberOfShares / us-gaap_AwardTypeAxis = brs_RestrictedStockAndRestrictedStockUnitsMember
Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				1 year 8 months 4 days			1 year 9 months 6 days
Share-based Compensation Vested Awards Fair Value				8,900,000brs_EmployeeServiceShareBasedCompensationVestedAwardsFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	5,100,000brs_EmployeeServiceShareBasedCompensationVestedAwardsFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	3,900,000brs_EmployeeServiceShareBasedCompensationVestedAwardsFairValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value				2,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	15,500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	6,300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options				5,200,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	15,400,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	15,300,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Tax benefit attributable to options exercised	1,600,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions	5,700,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions	500,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions	600,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	5,400,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember	1,900,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Stock-based compensation expense	16,353,000us-gaap_ShareBasedCompensation	15,433,000us-gaap_ShareBasedCompensation	11,869,000us-gaap_ShareBasedCompensation				10,100,000us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = brs_RestrictedStockAndRestrictedStockUnitsMember	9,400,000us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = brs_RestrictedStockAndRestrictedStockUnitsMember	7,400,000us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = brs_RestrictedStockAndRestrictedStockUnitsMember
Reduction From A Full Value Share Granted, Number Of Shares															2brs_ReductionFromAFullValueShareGrantedNumberOfShares / us-gaap_PlanNameAxis = brs_Plan2007Member
Reduction From An Option And Stock Appreciation Right Granted, Number Of Shares															1brs_ReductionFromAnOptionAndStockAppreciationRightGrantedNumberOfShares / us-gaap_PlanNameAxis = brs_Plan2007Member
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Restricted Stock, Nonvested, Number, Beginning Balance	459,717us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Restricted Stock, Grants in Period	172,808us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Restricted Stock, Vested in Period	207,561us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
Restricted Stock, Forfeited in Period	5,735us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
Restricted Stock, Nonvested, Number, Ending Balance	419,229us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber	459,717us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Restricted Stock, Weighted Average Grant Date Fair Value, Beginning Balance	$ 52.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Restricted Stock, Grants in Period, Weighted Average Grant Date Fair Value	$ 74.18us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Restricted Stock, Vested in Period, Weighted Average Grant Date Fair Value	$ 48.76us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue
Restricted Stock, Forfeitures, Weighted Average Grant Date Fair Value	$ 57.98us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
Restricted Stock, Weighted Average Grant Date Fair Value, Ending Balance	$ 62.81us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	$ 52.13us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Rabbi Trust investments																																																																																																																			2,379,000us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember	6,599,000us-gaap_OtherInvestments / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember	2,379,000us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember	6,599,000us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember	0us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember	0us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember	0us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember	0us-gaap_OtherInvestments / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Cash Bonus	19,900,000brs_CashBonus	17,200,000brs_CashBonus	12,200,000brs_CashBonus
One Time Bonus			3,300,000brs_OneTimeBonus
Contributions to deferred compensation plan	1,500,000brs_ContributionsToDeferredCompensationPlan	900,000brs_ContributionsToDeferredCompensationPlan	700,000brs_ContributionsToDeferredCompensationPlan
Compensation																												5,500,000us-gaap_SalariesAndWages / brs_RetirementAxis = brs_RetirementAgreementMember / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember
Voluntary Separation Program, Number Of Employees Offered	2,888brs_VoluntarySeparationProgramNumberOfEmployeesOffered
Voluntary Separation Program, Number Of Employees Acceptance	137brs_VoluntarySeparationProgramNumberOfEmployeesAcceptance
Voluntary Separation Program, Total Estimated Cost	7,200,000brs_VoluntarySeparationProgramTotalEstimatedCost
Voluntary Separation Program, Total Estimated Cost Recognized																																																																																																																$ 6,800,000brs_VoluntarySeparationProgramTotalEstimatedCostRecognized / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember

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- Definition

The plan limits the rate of annual increases in pensionable salary to the lesser of annual increases in UK price inflation or this percentage.

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Percentage of target amount of performance awards employees can receive based on performance results.

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No definition available.

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The amount of cash bonuses to key employees in accordance with the Annual Incentive Compensation Plan.

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No definition available.

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The maximum percentage of a participant's non-variable salary.

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The amount of contributions by the employer to a deferred compensation plan.

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The annual percentage of employees' compensation contributed at the end of each calendar year to defined contribution plan.

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No definition available.

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The number of unvested stock option shares as of the balance sheet date.

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The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares in accordance with the terms of the arrangement.

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No definition available.

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The members minimum percentage of non-variable salary for Bristow Helicopters to match the contribution.

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Number of original closed defined benefit pension plans.

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Number of other defined contribution plans.

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Number of other defined contribution plans closed to new members.

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The total amount of of a one-time cash bonus paid out to all employees.

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Number of objectives in the company’s pension plan investment strategy.

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The compensation expense related to performance cash awards.

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The maximum potential payout for the performance cash awards.

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The reduction to the number of shares available for issuance from a full value share granted.

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The reduction to the number of shares available for issuance from an option and stock appreciation right granted.

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Defined benefit pension plans pilots retirement age.

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Retirement age an employee is required to be upon retirement in exchange for full vesting of the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Years of service over which an employee is required to provide service prior to retirement in exchange for full vesting of the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Combined total age and years of service an employee is required to provide service upon retirement in exchange for full vesting of for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected social security base amount for Bristow Norway defined benefit pension plan.

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Number Of Employees Acceptance - Number of employees accepted the voluntary separation program.

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Number of employees the company offered the voluntary separation program to.

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Total estimated cost of the voluntary separation program.

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Total estimated cost to be recognized of the voluntary separation program.

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- Definition

Bristow Norway years of service as of the date of reitrement for maximum pension available.

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Aggregate number of common shares reserved for future issuance.

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-Name Accounting Standards Codification

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This represents the noncurrent liability recognized in the balance sheet that is associated with the defined benefit pension plans.

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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-Paragraph 10A

-Subparagraph (i-k)

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- Definition

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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- Definition

The amount of gains or losses recognized in net periodic benefit cost.

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Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

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No definition available.

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- Definition

Expected rate of compensation increases (for pay-related plans).

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The interest rate used to adjust for the time value of money.

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- Definition

An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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- Definition

Expected rate of compensation increases (for pay-related plans).

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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Other investments not otherwise specified in the taxonomy.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Period Type:	duration