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Asbestos - Asbestos-Related Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Mar. 31, 2014
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Insurance [Abstract] |  |
Asbestos liability - current | $ (131.6)jhx_AsbestosFundLiabilityCurrent | $ (134.5)jhx_AsbestosFundLiabilityCurrent
Asbestos liability - non-current | (1,290.0)jhx_AsbestosFundLiabilityNonCurrent | (1,571.7)jhx_AsbestosFundLiabilityNonCurrent
Asbestos liability - Total | (1,421.6)jhx_AsbestosFundLiability | (1,706.2)jhx_AsbestosFundLiability
Insurance receivable - current | 16.7 jhx_InsuranceReceivableAsbestosCurrent | 28.0 jhx_InsuranceReceivableAsbestosCurrent
Insurance receivable - non-current | 161.9 jhx_InsuranceReceivableAsbestosNoncurrent | 198.1 jhx_InsuranceReceivableAsbestosNoncurrent
Insurance receivable - Total | 178.6 jhx_InsuranceReceivableAsbestos | 226.1 jhx_InsuranceReceivableAsbestos
Workers' compensation asset - current | 4.5 jhx_WorkersCompensationAssetsAsbestosCurrent | 4.3 jhx_WorkersCompensationAssetsAsbestosCurrent
Workers' compensation asset - non-current | 45.5 jhx_WorkersCompensationAssetsAsbestosNoncurrent | 47.6 jhx_WorkersCompensationAssetsAsbestosNoncurrent
Workers' compensation liability - current | (4.5)jhx_WorkersCompensationLiabilityAsbestosCurrent | (4.3)jhx_WorkersCompensationLiabilityAsbestosCurrent
Workers' compensation liability - non-current | (45.5)jhx_WorkersCompensationLiabilitiesAsbestosNoncurrent | (47.6)jhx_WorkersCompensationLiabilitiesAsbestosNoncurrent
Workers' compensation - Total | 0 jhx_AsbestosWorkersCompensationAssetsLiabilitiesNet | 0 jhx_AsbestosWorkersCompensationAssetsLiabilitiesNet
Loan facility | (13.6)jhx_CurrentPortionOfLongTermDebtAsbestos | (47.0)jhx_CurrentPortionOfLongTermDebtAsbestos
Other net liabilities | (1.5)jhx_OtherNetAssetsLiabilitiesRelatedToAsbestos | (0.8)jhx_OtherNetAssetsLiabilitiesRelatedToAsbestos
Restricted cash and cash equivalents and restricted short-term investment assets of AICF | 22.0 jhx_RestrictedCashAndCashEquivalentsAndShortTermInvestmentsAsbestos | 60.3 jhx_RestrictedCashAndCashEquivalentsAndShortTermInvestmentsAsbestos
Net AFFA liability | (1,236.1)jhx_AsbestosNetAmendedLiability | (1,467.6)jhx_AsbestosNetAmendedLiability
Deferred income taxes - current | 15.9 jhx_DeferredTaxAssetsNetAsbestosCurrent | 16.5 jhx_DeferredTaxAssetsNetAsbestosCurrent
Deferred income taxes - non-current | 389.3 jhx_DeferredTaxAssetsNetAsbestosNoncurrent | 455.2 jhx_DeferredTaxAssetsNetAsbestosNoncurrent
Deferred income taxes - Total | 405.2 jhx_DeferredTaxAssetsNetAsbestos | 471.7 jhx_DeferredTaxAssetsNetAsbestos
Income tax payable | 19.2 jhx_IncomeTaxPayableAsbestos | 16.7 jhx_IncomeTaxPayableAsbestos
Net Unfunded AFFA liability, net of tax | $ (811.7)jhx_AsbestosUnfundedNetAmendedLiability | $ (979.2)jhx_AsbestosUnfundedNetAmendedLiability

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- Definition Carrying amount as of the balance sheet date for total reserves related to asbestos claims. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying value as of the balance sheet date of asbestos-related obligations incurred through that date and due within one year for estimated future asbestos claims. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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X
- Definition Carrying value as of the balance sheet date of asbestos-related obligations incurred through that date and due after one year for estimated future asbestos claims. + References No definition available. + Details
Name: | jhx_AsbestosFundLiabilityNonCurrent
Namespace Prefix: | jhx_
Data Type: | xbrli:monetaryItemType
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X
- Definition Asbestos net amended liability. + References No definition available. + Details
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Namespace Prefix: | jhx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Asbestos unfunded net amended liability. + References No definition available. + Details
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X
- Definition Asbestos workers compensation assets liabilities net. + References No definition available. + Details
Name: | jhx_AsbestosWorkersCompensationAssetsLiabilitiesNet
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- Definition Total portion of carrying amounts as of the balance sheet date of AICF drawdown of loan facility with The State of New South Wales Australia. All amounts outstanding were fully repaid on 3 April 2012. + References No definition available. + Details
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- Definition Total Australian tax benefits as of the balance sheet date that will be available to the Company in relation to the Company's contributions to the AICF. + References No definition available. + Details
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- Definition Current portion of Australian tax benefits as of the balance sheet date that will be available to the Company during the subsequent twelve months in relation to the Company's contributions to the AICF. + References No definition available. + Details
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- Definition Non current portion of Australian tax benefits as of the balance sheet date that will be available to the Company in relation to the Company's contributions to the AICF. + References No definition available. + Details
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- Definition Australian tax deduction available to be taken by the Company resulting from the Company's previous contributions to AICF. + References No definition available. + Details
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- Definition Total receivable due as of the balance sheet date from various insurance policies and insurance companies for reimbursement and payment of asbestos claims. + References No definition available. + Details
Name: | jhx_InsuranceReceivableAsbestos
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- Definition The estimated receivable due within one year of the balance sheet date from various insurance policies and insurance companies for reimbursement and payment of asbestos claims. + References No definition available. + Details
Name: | jhx_InsuranceReceivableAsbestosCurrent
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Data Type: | xbrli:monetaryItemType
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- Definition The estimated receivable due after one year from the balance sheet date from various insurance policies and insurance companies for reimbursement and payment of asbestos claims. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Comprised of a provision for asbestos-related education and medical research contributions and other assets and liabilities of the AICF. + References No definition available. + Details
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- Definition Total carrying amounts of cash and cash equivalents and short term investments of the AICF that are restricted for use in the settlement of asbestos claims and payment of the operating costs of the AICF. + References No definition available. + Details
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- Definition Current amount of workers compensation receivable that is expected to be paid within one year of the balance sheet by the workers' compensation schemes or policies of the Former James Hardie Companies. + References No definition available. + Details
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- Definition Noncurrent amount of workers compensation receivable that is expected to be paid after one year of the balance sheet by the workers' compensation schemes or policies of the Former James Hardie Companies. + References No definition available. + Details
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- Definition Noncurrent portion of workers' compensation claims (due after one year or the normal operating cycle, if longer) that are expected to be met by the workers' compensation schemes or policies of the Former James Hardie Companies. Since these amounts are expected to be paid by the workers' compensation schemes or policies, the company records an equivalent workers' compensation receivable. + References No definition available. + Details
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- Definition Current portion of workers' compensation claims (due within one year or within the normal operating cycle if longer) that are expected to be met by the workers' compensation schemes or policies of the Former James Hardie Companies. Since these amounts are expected to be paid by the workers' compensation schemes or policies, the company records an equivalent workers' compensation receivable. + References No definition available. + Details
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- Details
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