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Asbestos - Summary of Net Unfunded AFFA Liability, Net of Tax (Detail) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 USD ($) | Mar. 31, 2015 AUD | Mar. 31, 2014 USD ($) | Mar. 31, 2013 USD ($) | Mar. 31, 2015 Asbestos Liability [Member] USD ($) | Mar. 31, 2015 Insurance Receivables [Member] USD ($) | Mar. 31, 2015 Deferred Tax Assets [Member] USD ($) | Mar. 31, 2015 Other Loan Facilities [Member] USD ($) | Mar. 31, 2015 Restricted Cash and Investments [Member] USD ($) | Mar. 31, 2015 Other Assets and Liabilities [Member] USD ($)
Asbestos Claims [Line Items] |  |  |  |  |  |  |  |  |  |
Net Unfunded AFFA liability, net of tax, Beginning Balance | $ 979.2 jhx_AsbestosUnfundedNetAmendedLiability |  |  |  | $ (1,706.2)jhx_AsbestosUnfundedNetAmendedLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_AsbestosLiabilityMember | $ 226.1 jhx_AsbestosUnfundedNetAmendedLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_InsuranceReceivablesMember | $ 471.7 jhx_AsbestosUnfundedNetAmendedLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_DeferredTaxAssetsMember | $ (47.0)jhx_AsbestosUnfundedNetAmendedLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_OtherLoanFacilitiesMember | $ 60.3 jhx_AsbestosUnfundedNetAmendedLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_RestrictedCashAndShortTermInvestmentsMember | $ 15.9 jhx_AsbestosUnfundedNetAmendedLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_OtherAssetsAndLiabilitiesMember
Asbestos claims paid | (135.1)jhx_LiabilityForAsbestosClaimsNetClaimPaid | (154.3)jhx_LiabilityForAsbestosClaimsNetClaimPaid |  |  | 135.1 jhx_LiabilityForAsbestosClaimsNetClaimPaid / us-gaap_FairValueByLiabilityClassAxis = jhx_AsbestosLiabilityMember |  |  |  | (135.1)jhx_LiabilityForAsbestosClaimsNetClaimPaid / us-gaap_FairValueByLiabilityClassAxis = jhx_RestrictedCashAndShortTermInvestmentsMember |
Payment received in accordance with AFFA | 113.0 jhx_PaymentsReceivedInAccordanceWithAmendedAndRestatedFinalFundingAgreement |  |  |  |  |  |  |  | 113.0 jhx_PaymentsReceivedInAccordanceWithAmendedAndRestatedFinalFundingAgreement / us-gaap_FairValueByLiabilityClassAxis = jhx_RestrictedCashAndShortTermInvestmentsMember |
AICF claims-handling costs incurred (paid) |  |  |  |  | 1.6 jhx_AsbestosInjuriesCompensationFundClaimsHandlingCostsIncurred / us-gaap_FairValueByLiabilityClassAxis = jhx_AsbestosLiabilityMember |  |  |  | (1.6)jhx_AsbestosInjuriesCompensationFundClaimsHandlingCostsIncurred / us-gaap_FairValueByLiabilityClassAxis = jhx_RestrictedCashAndShortTermInvestmentsMember |
AICF operating costs paid - non claims-handling | (2.5)jhx_AicfOperatingCostPaidNonClaimHandling |  | (2.1)jhx_AicfOperatingCostPaidNonClaimHandling | (1.7)jhx_AicfOperatingCostPaidNonClaimHandling |  |  |  |  | (2.5)jhx_AicfOperatingCostPaidNonClaimHandling / us-gaap_FairValueByLiabilityClassAxis = jhx_RestrictedCashAndShortTermInvestmentsMember |
Change in actuarial estimate | (129.0)jhx_ChangeInActuarialEstimateAsbestosLiability |  | (340.3)jhx_ChangeInActuarialEstimateAsbestosLiability | (163.0)jhx_ChangeInActuarialEstimateAsbestosLiability | (129.0)jhx_ChangeInActuarialEstimateAsbestosLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_AsbestosLiabilityMember | 16.6 jhx_ChangeInActuarialEstimateAsbestosLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_InsuranceReceivablesMember |  |  |  |
Change in claims handling cost estimate | 1.1 jhx_ChangeInEstimateClaimsHandlingCosts |  | 0.9 jhx_ChangeInEstimateClaimsHandlingCosts | 5.9 jhx_ChangeInEstimateClaimsHandlingCosts | 1.1 jhx_ChangeInEstimateClaimsHandlingCosts / us-gaap_FairValueByLiabilityClassAxis = jhx_AsbestosLiabilityMember |  |  |  |  |
Insurance recoveries |  |  |  |  |  | (29.1)jhx_InsuranceRecoveriesAsbestos / us-gaap_FairValueByLiabilityClassAxis = jhx_InsuranceReceivablesMember |  |  | 29.1 jhx_InsuranceRecoveriesAsbestos / us-gaap_FairValueByLiabilityClassAxis = jhx_RestrictedCashAndShortTermInvestmentsMember |
Change in non-actuarial estimate | 38.3 jhx_ChangeInNonActuarialEstimateAsbestosLiability |  |  |  |  |  | 38.3 jhx_ChangeInNonActuarialEstimateAsbestosLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_DeferredTaxAssetsMember |  |  |
Offset to Income Tax Payable | (22.0)jhx_AmountOfDeferredTaxAssetsAppliedToIncomeTaxPayable |  | (16.7)jhx_AmountOfDeferredTaxAssetsAppliedToIncomeTaxPayable |  |  |  | (22.0)jhx_AmountOfDeferredTaxAssetsAppliedToIncomeTaxPayable / us-gaap_FairValueByLiabilityClassAxis = jhx_DeferredTaxAssetsMember |  |  |
Funds received from NSW under loan agreement |  |  |  |  |  |  |  | (13.8)jhx_ProceedsFromSecuredDebt / us-gaap_FairValueByLiabilityClassAxis = jhx_OtherLoanFacilitiesMember | 13.8 jhx_ProceedsFromSecuredDebt / us-gaap_FairValueByLiabilityClassAxis = jhx_RestrictedCashAndShortTermInvestmentsMember |
Funds repaid to NSW under loan agreement |  |  |  |  |  |  |  | 48.2 us-gaap_RepaymentsOfSecuredDebt / us-gaap_FairValueByLiabilityClassAxis = jhx_OtherLoanFacilitiesMember | (48.2)us-gaap_RepaymentsOfSecuredDebt / us-gaap_FairValueByLiabilityClassAxis = jhx_RestrictedCashAndShortTermInvestmentsMember |
Other movements | 7.3 jhx_RestrictedCashCashEquivalentAndShortTermInvestmentOtherChanges |  |  |  |  |  | 0.4 jhx_RestrictedCashCashEquivalentAndShortTermInvestmentOtherChanges / us-gaap_FairValueByLiabilityClassAxis = jhx_DeferredTaxAssetsMember | (0.1)jhx_RestrictedCashCashEquivalentAndShortTermInvestmentOtherChanges / us-gaap_FairValueByLiabilityClassAxis = jhx_OtherLoanFacilitiesMember | 2.2 jhx_RestrictedCashCashEquivalentAndShortTermInvestmentOtherChanges / us-gaap_FairValueByLiabilityClassAxis = jhx_RestrictedCashAndShortTermInvestmentsMember | 4.8 jhx_RestrictedCashCashEquivalentAndShortTermInvestmentOtherChanges / us-gaap_FairValueByLiabilityClassAxis = jhx_OtherAssetsAndLiabilitiesMember
Effect of foreign exchange | 144.7 jhx_ForeignExchangeGainLossInAsbestosLiability |  |  |  | 275.8 jhx_ForeignExchangeGainLossInAsbestosLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_AsbestosLiabilityMember | (35.0)jhx_ForeignExchangeGainLossInAsbestosLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_InsuranceReceivablesMember | (83.2)jhx_ForeignExchangeGainLossInAsbestosLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_DeferredTaxAssetsMember | (0.9)jhx_ForeignExchangeGainLossInAsbestosLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_OtherLoanFacilitiesMember | (9.0)jhx_ForeignExchangeGainLossInAsbestosLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_RestrictedCashAndShortTermInvestmentsMember | (3.0)jhx_ForeignExchangeGainLossInAsbestosLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_OtherAssetsAndLiabilitiesMember
Net Unfunded AFFA liability, net of tax, Ending Balance | $ 811.7 jhx_AsbestosUnfundedNetAmendedLiability |  | $ 979.2 jhx_AsbestosUnfundedNetAmendedLiability |  | $ (1,421.6)jhx_AsbestosUnfundedNetAmendedLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_AsbestosLiabilityMember | $ 178.6 jhx_AsbestosUnfundedNetAmendedLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_InsuranceReceivablesMember | $ 405.2 jhx_AsbestosUnfundedNetAmendedLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_DeferredTaxAssetsMember | $ (13.6)jhx_AsbestosUnfundedNetAmendedLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_OtherLoanFacilitiesMember | $ 22.0 jhx_AsbestosUnfundedNetAmendedLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_RestrictedCashAndShortTermInvestmentsMember | $ 17.7 jhx_AsbestosUnfundedNetAmendedLiability / us-gaap_FairValueByLiabilityClassAxis = jhx_OtherAssetsAndLiabilitiesMember

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- Definition AICF operating cost paid non claim handling. + References No definition available. + Details
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- Definition Portion of deferred income tax asset that becomes available to the Company as an Australian tax deduction resulting from the Company's previous contributions to AICF. + References No definition available. + Details
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- Details
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Balance Type: | na
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- Definition Asbestos injuries compensation fund claims handling costs incurred. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Asbestos unfunded net amended liability. + References No definition available. + Details
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- Definition Change in actuarial estimate asbestos liability. + References No definition available. + Details
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- Definition Change in estimate claims handling costs. + References No definition available. + Details
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- Definition Change in non actuarial estimate asbestos liability. + References No definition available. + Details
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Balance Type: | credit
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- Definition Foreign exchange gain or loss in the asbestos liability due to change in closing exchange rates between the currencies at the beginning and ending balance sheet dates. + References No definition available. + Details
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Balance Type: | credit
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- Definition The amount recovered from insurance related to asbestos claims which reduce asbestos receivable. + References No definition available. + Details
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Namespace Prefix: | jhx_
Data Type: | xbrli:monetaryItemType
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- Definition Liability for asbestos claims net claim paid. + References No definition available. + Details
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Namespace Prefix: | jhx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Payments received in accordance with amended and restated final funding agreement. + References No definition available. + Details
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