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Asbestos - Summary of Net Unfunded AFFA Liability, Net of Tax (Parenthetical) (Detail)
In Millions, unless otherwise specified |
12 Months Ended | ||||
|---|---|---|---|---|---|
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Mar. 31, 2015
USD ($)
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Mar. 31, 2015
AUD
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Mar. 31, 2014
USD ($)
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Mar. 31, 2013
USD ($)
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Mar. 31, 2015
Other Assets and Liabilities [Member]
USD ($)
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| Asbestos Claims [Line Items] | |||||
| Amounts offset against income tax payable | $ 22.0jhx_AmountOfDeferredTaxAssetsAppliedToIncomeTaxPayable | $ 16.7jhx_AmountOfDeferredTaxAssetsAppliedToIncomeTaxPayable | |||
| Favorable effect of foreign currency exchange in respect of income taxes payable | 3.5jhx_ForeignExchangeGainLossIncomeTaxesPayableAsbestos | ||||
| Provision for asbestos-related education and medical research contribution | 1.4jhx_ProvisionForAsbestosRelatedEducationAndMedicalResearchContribution | 1.7jhx_ProvisionForAsbestosRelatedEducationAndMedicalResearchContribution | |||
| Net liability of AICF | (1.5)jhx_NetOtherAssetsAndLiabilitiesOfAsbestosInjuriesCompensationFund | (0.8)jhx_NetOtherAssetsAndLiabilitiesOfAsbestosInjuriesCompensationFund | |||
| Effect of foreign currency exchange on other assets and liabilities | 144.7jhx_AsbestosAdjustmentGainLossOnForeignExchange | 97.2jhx_AsbestosAdjustmentGainLossOnForeignExchange | 0.2jhx_AsbestosAdjustmentGainLossOnForeignExchange |
0.2jhx_AsbestosAdjustmentGainLossOnForeignExchange / us-gaap_BalanceSheetLocationAxis = jhx_OtherAssetsAndLiabilitiesMember |
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| Asbestos claims paid | $ 135.1jhx_LiabilityForAsbestosClaimsNetClaimPaid | 154.3jhx_LiabilityForAsbestosClaimsNetClaimPaid | |||
| X | ||||||||||
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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. No definition available.
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| X | ||||||||||
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- Definition
Gain (loss) on foreign exchange movements in the asbestos related assets and liabilities which are denominated in Australian dollars. No definition available.
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Foreign exchange gain or loss in income taxes payable due to change in closing exchange rates between the currencies at the beginning and ending balance sheet dates. No definition available.
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| X | ||||||||||
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- Definition
Liability for asbestos claims net claim paid. No definition available.
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| X | ||||||||||
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- Definition
Net Other Assets And Liabilities Of Asbestos Injuries Compensation Fund No definition available.
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| X | ||||||||||
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- Definition
Provision to fund asbestos-related research and education initiatives for a period of 10 years, beginning in fiscal year 2007. No definition available.
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