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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
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2015 USD ($) | Mar. 31, 2015 AUD | Mar. 31, 2014 USD ($) | Mar. 31, 2013 USD ($) | Mar. 31, 2015 USD ($) | 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 ($)
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax loss carry-forwards |  |  |  |  |  |  |  | $ 6.0 us-gaap_OperatingLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = us-gaap_EuropeMember |  | $ 11.1 us-gaap_OperatingLossCarryforwards / us-gaap_TaxCreditCarryforwardAxis = country_AU |  |  |  |
Tax loss carry-forwards available to offset future taxable income not subject to expiration |  |  |  |  |  |  |  | 4.5 jhx_OperatingLossCarryforwardsNotSubjectToExpiration / us-gaap_TaxCreditCarryforwardAxis = us-gaap_EuropeMember |  |  |  |  |  |
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 |  |  |  |  |
Operating loss carry-forwards subject to expiration |  |  |  |  |  |  |  | 1.5 jhx_OperatingLossCarryforwardsSubjectToExpiration / us-gaap_TaxCreditCarryforwardAxis = us-gaap_EuropeMember |  |  |  |  |  |
Recognized tax deduction | 73.4 us-gaap_IncomeTaxReconciliationDeductions | 83.8 us-gaap_IncomeTaxReconciliationDeductions |  |  |  |  |  |  |  |  |  |  |  |
Contribution to AICF | 113.0 jhx_PaymentToFund |  |  | 184.1 jhx_PaymentToFund | 412.3 jhx_PaymentToFund | 419.1 jhx_PaymentToFund |  |  |  |  |  |  |  |
Foreign tax credit carryforwards | 107.0 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign |  | 135.4 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign |  | 107.0 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign |  |  |  | 107.0 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign / us-gaap_TaxCreditCarryforwardAxis = us-gaap_ForeignCountryMember |  |  |  |  |
Income taxes payable, current | 1.8 us-gaap_AccruedIncomeTaxesCurrent |  | 5.4 us-gaap_AccruedIncomeTaxesCurrent |  | 1.8 us-gaap_AccruedIncomeTaxesCurrent |  |  |  |  |  |  |  |  |
Income tax paid, net of refunds | 29.9 us-gaap_IncomeTaxesPaidNet |  |  |  |  |  |  |  |  |  |  |  |  |
Withholding tax paid | 5.7 jhx_PaymentsRelatedToTaxWithholdingForInterestRoyaltiesDividends |  |  |  |  |  |  |  |  |  |  |  |  |
Undistributed foreign earnings |  |  |  |  |  |  |  |  |  |  | 204.8 jhx_UndistributedForeignEarnings / us-gaap_TaxCreditCarryforwardAxis = jhx_ForeignSubsidiariesMember |  |  |
Total amount of unrecognized tax benefits | 4.9 us-gaap_UnrecognizedTaxBenefits |  | 0.5 us-gaap_UnrecognizedTaxBenefits | 1.5 us-gaap_UnrecognizedTaxBenefits | 4.9 us-gaap_UnrecognizedTaxBenefits |  | 2.6 us-gaap_UnrecognizedTaxBenefits |  |  |  |  |  |  |
Total amount of interest and penalties accrued | 0.3 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |  | 0.1 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued | 0.3 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  | 0.9 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued |  |  |  |  |  |  |
Unrecognized tax benefits that would not affect the tax expense if recognized | 4.1 jhx_UnrecognizedTaxBenefitsThatWouldNotImpactEffectiveTaxRate |  |  |  | 4.1 jhx_UnrecognizedTaxBenefitsThatWouldNotImpactEffectiveTaxRate |  |  |  |  |  |  |  |  |
Interest and penalties recognized income tax expense | (0.3)us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense |  | 0.1 us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense |  |  |  |  |  |  |  |  |  |  |
Period for the amount of unrecognized tax benefits increase or decrease | Next twelve months | Next twelve months |  |  |  |  |  |  |  |  |  |  |  |
Aggregate refund amended assessment |  |  |  |  |  |  |  |  |  |  |  |  |  | 396.3 jhx_AggregateRefundAmendedAssessment / dei_LegalEntityAxis = jhx_RciMember
Income tax benefit from RCI's successful appeal |  |  |  |  |  |  |  |  |  |  |  | $ 15.4 jhx_IncomeTaxBenefitRelatedToAmendedAssessment / dei_LegalEntityAxis = jhx_RciMember | 17.3 jhx_IncomeTaxBenefitRelatedToAmendedAssessment / dei_LegalEntityAxis = jhx_RciMember |

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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. + References No definition available. + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 9 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(1) -Article 7 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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