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Stock-Based Compensation - Additional Information (Detail) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended
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Sep. 16, 2014 | Sep. 16, 2013 | Mar. 31, 2015 USD ($) | Mar. 31, 2015 AUD | Mar. 31, 2014 USD ($) | Mar. 31, 2014 AUD | Mar. 31, 2013 USD ($) | Mar. 05, 2015 Restricted Stock Units Service Vesting [Member] | Dec. 09, 2014 Restricted Stock Units Service Vesting [Member] | Mar. 05, 2014 Restricted Stock Units Service Vesting [Member] | Jan. 24, 2014 Restricted Stock Units Service Vesting [Member] | Dec. 09, 2013 Restricted Stock Units Service Vesting [Member] | Sep. 16, 2013 Restricted Stock Units Service Vesting [Member] | Mar. 17, 2015 Restricted Stock Units (Market Condition) [Member] | Sep. 16, 2014 Restricted Stock Units (Market Condition) [Member] | Sep. 16, 2013 Restricted Stock Units (Market Condition) [Member] | Jun. 06, 2014 Long Term Incentive Award [Member] | Jun. 29, 2013 Long Term Incentive Award [Member] | Jun. 06, 2014 Long Term Incentive Award [Member] Maximum [Member] | Jun. 29, 2013 Long Term Incentive Award [Member] Maximum [Member] | Jun. 06, 2014 Long Term Incentive Award [Member] Maximum [Member] James Hardie Industries Plc [Member] | Sep. 16, 2014 Restricted Stock Units Performance Vesting [Member] | Jun. 06, 2014 Restricted Stock Units Performance Vesting [Member] | Sep. 16, 2013 Restricted Stock Units Performance Vesting [Member] | Jun. 07, 2013 Restricted Stock Units Performance Vesting [Member] | Jun. 07, 2012 Restricted Stock Units Performance Vesting [Member] | Mar. 31, 2015 Restricted Stock Units Performance Vesting [Member] | Mar. 31, 2015 2001 Equity Incentive Plan [Member] | Mar. 31, 2014 2001 Equity Incentive Plan [Member] | Aug. 31, 2007 Long-Term Incentive Plan 2006 [Member] | Nov. 30, 2006 Long-Term Incentive Plan 2006 [Member] | Mar. 31, 2015 Long-Term Incentive Plan 2006 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost related to stock-based compensation cost |  |  | $ 12.2 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated weighted average amortization, period of recognition |  |  | 1 year 6 months | 1 year 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue of shares authorized |  |  | 2,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized | 2,000,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized | 710,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized | 710,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,077,100 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = jhx_TwoThousandOneEquityIncentivePlanMember |  |  |  |
Percentage of options exercised after first year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00%jhx_PercentageOfOptionsExercisedAfterFirstYear / us-gaap_PlanNameAxis = jhx_TwoThousandOneEquityIncentivePlanMember |  |  |  |
Percentage of options exercised after second year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00%jhx_PercentageOfOptionsExercisedAfterSecondYear / us-gaap_PlanNameAxis = jhx_TwoThousandOneEquityIncentivePlanMember |  |  |  |
Percentage of options exercised after third year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%jhx_PercentageOfOptionsExercisedAfterThirdYear / us-gaap_PlanNameAxis = jhx_TwoThousandOneEquityIncentivePlanMember |  |  |  |
Unexercised options expiration year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  | 10 years
Unexercised options expiration days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90 days |  |  |  |
Restricted stock units granted |  |  | 1,192,225 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod | 1,192,225 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod | 1,266,656 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod | 1,266,656 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod |  |  | 329,192 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = jhx_RestrictedStockUnitsServiceVestingMember |  |  | 259,621 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = jhx_RestrictedStockUnitsServiceVestingMember | 56,128 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = jhx_RestrictedStockUnitsServiceVestingMember |  | 459,317 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = jhx_RestrictedStockUnitsMarketConditionMember | 489,888 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = jhx_RestrictedStockUnitsMarketConditionMember |  |  |  |  |  |  |  |  |  |  |  | 329,192 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = jhx_TwoThousandOneEquityIncentivePlanMember | 315,749 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_PlanNameAxis = jhx_TwoThousandOneEquityIncentivePlanMember |  |  |
Restricted stock units outstanding |  |  | 4,008,001 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber | 4,008,001 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber | 3,883,918 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber | 3,883,918 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber | 4,004,368 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 657,870 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_PlanNameAxis = jhx_TwoThousandOneEquityIncentivePlanMember |  |  |  | 3,350,131 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_PlanNameAxis = jhx_LongTermIncentivePlanMember
LTI units granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 445,141 jhx_LongTermIncentivePlanStockUnits / us-gaap_AwardTypeAxis = jhx_LongTermIncentiveAwardsMember | 324,027 jhx_LongTermIncentivePlanStockUnits / us-gaap_AwardTypeAxis = jhx_LongTermIncentiveAwardsMember | 716,536 jhx_LongTermIncentivePlanStockUnits / us-gaap_AwardTypeAxis = jhx_LongTermIncentiveAwardsMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 821,459 jhx_LongTermIncentivePlanStockUnits / us-gaap_AwardTypeAxis = jhx_LongTermIncentiveAwardsMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  | 403,716 jhx_LongTermIncentivePlanStockUnits / us-gaap_AwardTypeAxis = jhx_RestrictedStockUnitsPerformanceVestingMember |  | 461,019 jhx_LongTermIncentivePlanStockUnits / us-gaap_AwardTypeAxis = jhx_RestrictedStockUnitsPerformanceVestingMember |  | 266,627 jhx_LongTermIncentivePlanStockUnits / us-gaap_AwardTypeAxis = jhx_RestrictedStockUnitsPerformanceVestingMember |  |  |  |  |  | 9,079,932 jhx_LongTermIncentivePlanStockUnits / us-gaap_PlanNameAxis = jhx_LongTermIncentivePlanMember
Granted options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,016,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = jhx_LongTermIncentivePlanMember | 1,132,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod / us-gaap_PlanNameAxis = jhx_LongTermIncentivePlanMember |
Options outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingPeriodIncreaseDecrease / us-gaap_PlanNameAxis = jhx_LongTermIncentivePlanMember
Intrinsic value of stock options exercised |  |  |  | 3.6 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |  | 13.8 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax benefits from stock options exercised |  |  | $ 1.4 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities |  | $ 5.6 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities |  | $ 3.5 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing stock price |  |  |  | 15.26 jhx_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsMarketSharePrice |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units vested |  |  | 774,675 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod | 774,675 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod | 1,227,372 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod | 1,227,372 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod |  | 1,901 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = jhx_RestrictedStockUnitsServiceVestingMember | 220,984 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = jhx_RestrictedStockUnitsServiceVestingMember | 950 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = jhx_RestrictedStockUnitsServiceVestingMember | 4,281 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = jhx_RestrictedStockUnitsServiceVestingMember | 253,741 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = jhx_RestrictedStockUnitsServiceVestingMember |  | 275,682 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = jhx_RestrictedStockUnitsMarketConditionMember |  |  |  |  |  |  |  |  | 237,239 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = jhx_RestrictedStockUnitsPerformanceVestingMember |  | 61,363 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = jhx_RestrictedStockUnitsPerformanceVestingMember |  |  |  |  |  |  |
Restricted stock unit deferred vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  | 2 years |  |  |  |  |
Scorecard LTI - cash settled units granted under the terms of LTIP | 454,179 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward | 518,647 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesPurchasedForAward |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average closing price period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 days |  |  |  |  |  |  |  |  |  |  |

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11374-113907 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The increase or decrease in number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding, including vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares purchased on the open market during the period for issuance to employees under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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