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v2.4.1.9

Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Unrealized gains/(losses) on available-for-sale securities, tax | $ 0 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax | $ 115 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax | $ (200)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Amortization of loss on derivative contract, tax | 0 tdw_OtherComprehensiveIncomeAmortizationOfLossOnDerivativeContractTax | 251 tdw_OtherComprehensiveIncomeAmortizationOfLossOnDerivativeContractTax | 251 tdw_OtherComprehensiveIncomeAmortizationOfLossOnDerivativeContractTax
Change in supplemental executive retirement plan pension liability, tax | 0 tdw_OtherComprehensiveIncomeSupplementalExecutiveRetirementPlanMinimumLiabilityAdjustmentTaxPeriodIncreaseDecrease | 409 tdw_OtherComprehensiveIncomeSupplementalExecutiveRetirementPlanMinimumLiabilityAdjustmentTaxPeriodIncreaseDecrease | 1,306 tdw_OtherComprehensiveIncomeSupplementalExecutiveRetirementPlanMinimumLiabilityAdjustmentTaxPeriodIncreaseDecrease
Change in Pension Plan minimum liability, tax | 0 tdw_OtherComprehensiveIncomePensionPlanMinimumLiabilityAdjustmentTaxPeriodIncreaseDecrease | 763 tdw_OtherComprehensiveIncomePensionPlanMinimumLiabilityAdjustmentTaxPeriodIncreaseDecrease | (290)tdw_OtherComprehensiveIncomePensionPlanMinimumLiabilityAdjustmentTaxPeriodIncreaseDecrease
Change in Other Benefit Plan minimum liability, tax | $ (769)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax | $ 1,109 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax | $ 111 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax

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- Definition Other Comprehensive Income, Amortization of Loss on Derivative Contract, Tax + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Other Comprehensive Income Pension Plan Minimum Liability Adjustment Tax Period Increase Decrease + References No definition available. + Details
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Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Other Comprehensive Income Supplemental Executive Retirement Plan Minimum Liability Adjustment Tax Period Increase Decrease + References No definition available. + Details
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Namespace Prefix: | tdw_
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- Definition Amount of tax (expense) benefit, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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- Definition Amount of tax expense (benefit) before reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e,f) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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