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Income Taxes - Additional Information (Detail)
In Millions, unless otherwise specified |
12 Months Ended | 48 Months Ended | 0 Months Ended | 3 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Mar. 31, 2015
USD ($)
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Mar. 31, 2015
AUD
|
Mar. 31, 2014
USD ($)
|
Mar. 31, 2013
USD ($)
|
Mar. 31, 2015
USD ($)
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Mar. 31, 2015
AUD
|
Mar. 31, 2012
USD ($)
|
Mar. 31, 2015
Europe [Member]
USD ($)
|
Mar. 31, 2015
Foreign Tax Credit Carry-Forwards [Member]
USD ($)
|
Mar. 31, 2015
Australia [Member]
USD ($)
|
Mar. 31, 2015
Foreign Subsidiaries [Member]
USD ($)
|
Nov. 04, 2013
RCI [Member]
USD ($)
|
Nov. 04, 2013
RCI [Member]
AUD
|
Mar. 31, 2012
RCI [Member]
USD ($)
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| Tax Credit Carryforward [Line Items] | ||||||||||||||
| Tax loss carry-forwards |
$ 6.0us-gaap_OperatingLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = us-gaap_EuropeMember |
$ 11.1us-gaap_OperatingLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = country_AU |
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| Tax loss carry-forwards available to offset future taxable income not subject to expiration |
4.5jhx_OperatingLossCarryforwardsNotSubjectToExpiration / us-gaap_TaxCreditCarryforwardAxis = us-gaap_EuropeMember |
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| Percentage of valuation allowance against loss carry-forwards |
100.00%jhx_PercentageOfValuationAllowanceAgainstLossCarryForwards / us-gaap_TaxCreditCarryforwardAxis = us-gaap_EuropeMember |
100.00%jhx_PercentageOfValuationAllowanceAgainstLossCarryForwards / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ForeignCountryMember |
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| Operating loss carry-forwards subject to expiration |
1.5jhx_OperatingLossCarryforwardsSubjectToExpiration / us-gaap_TaxCreditCarryforwardAxis = us-gaap_EuropeMember |
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| Recognized tax deduction | 73.4us-gaap_IncomeTaxReconciliationDeductions | 83.8us-gaap_IncomeTaxReconciliationDeductions | ||||||||||||
| Contribution to AICF | 113.0jhx_PaymentToFund | 184.1jhx_PaymentToFund | 412.3jhx_PaymentToFund | 419.1jhx_PaymentToFund | ||||||||||
| Foreign tax credit carryforwards | 107.0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | 135.4us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | 107.0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign |
107.0us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ForeignCountryMember |
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| Income taxes payable, current | 1.8us-gaap_AccruedIncomeTaxesCurrent | 5.4us-gaap_AccruedIncomeTaxesCurrent | 1.8us-gaap_AccruedIncomeTaxesCurrent | |||||||||||
| Income tax paid, net of refunds | 29.9us-gaap_IncomeTaxesPaidNet | |||||||||||||
| Withholding tax paid | 5.7jhx_PaymentsRelatedToTaxWithholdingForInterestRoyaltiesDividends | |||||||||||||
| Undistributed foreign earnings |
204.8jhx_UndistributedForeignEarnings / us-gaap_TaxCreditCarryforwardAxis = jhx_ForeignSubsidiariesMember |
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| Total amount of unrecognized tax benefits | 4.9us-gaap_UnrecognizedTaxBenefits | 0.5us-gaap_UnrecognizedTaxBenefits | 1.5us-gaap_UnrecognizedTaxBenefits | 4.9us-gaap_UnrecognizedTaxBenefits | 2.6us-gaap_UnrecognizedTaxBenefits | |||||||||
| Total amount of interest and penalties accrued | 0.3us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 0.1us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 0.3us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 0.9us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | ||||||||||
| Unrecognized tax benefits that would not affect the tax expense if recognized | 4.1jhx_UnrecognizedTaxBenefitsThatWouldNotImpactEffectiveTaxRate | 4.1jhx_UnrecognizedTaxBenefitsThatWouldNotImpactEffectiveTaxRate | ||||||||||||
| Interest and penalties recognized income tax expense | (0.3)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | 0.1us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense | ||||||||||||
| Period for the amount of unrecognized tax benefits increase or decrease | Next twelve months | Next twelve months | ||||||||||||
| Aggregate refund amended assessment |
396.3jhx_AggregateRefundAmendedAssessment / dei_LegalEntityAxis = jhx_RciMember |
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| Income tax benefit from RCI's successful appeal |
$ 15.4jhx_IncomeTaxBenefitRelatedToAmendedAssessment / dei_LegalEntityAxis = jhx_RciMember |
17.3jhx_IncomeTaxBenefitRelatedToAmendedAssessment / dei_LegalEntityAxis = jhx_RciMember |
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| X | ||||||||||
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- Definition
Total amount of amended assessment refunded by the ATO. No definition available.
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| X | ||||||||||
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- Definition
Income tax benefit recognized as a result of RCI's successful appeal of the ATO amended assessment. No definition available.
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| X | ||||||||||
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- Definition
European operating loss carryforwards not subject to expiration. No definition available.
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| X | ||||||||||
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- Definition
European operating loss carryforwards subject to expiration. No definition available.
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| X | ||||||||||
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- Definition
Amount of cash outflow to satisfy withholding tax payments on interest, royalties and dividends. No definition available.
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| X | ||||||||||
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- Definition
Under the terms of the Amended and Restated Final Funding Agreement (AFFA), a wholly owned Australian subsidiary (the Performing Subsidiary) has an obligation to make payments to the AICF on an annual basis. The amount of these annual payments is dependent on several factors, including the Company's free cash flow (as defined by the AFFA), actuarial estimations, actual claims paid, operating expenses of the AICF and the annual cash flow cap. No definition available.
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| X | ||||||||||
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- Definition
Percentage of valuation allowance against loss carry forwards. No definition available.
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| X | ||||||||||
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- Definition
Undistributed foreign earnings. No definition available.
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| X | ||||||||||
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- Definition
Unrecognized Tax Benefits That Would Not Impact Effective Tax Rate No definition available.
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| X | ||||||||||
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- Definition
Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deductions. Including, but not limited to, extraterritorial income exclusion deduction, qualified production activity deduction, dividend deduction, deduction for dividend paid to employee stock ownership plan, Medicare prescription drug benefit subsidy deduction, and other deductions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
This element provides a description of the nature of the event that could occur within twelve months of the reporting date that would cause a significant increase or decrease in the related unrecognized tax benefit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Details
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| X | ||||||||||
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- Definition
Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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