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Asbestos - Asbestos-Related Assets and Liabilities (Detail) - USD ($) $ in Millions | Mar. 31, 2017 | Mar. 31, 2016
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Insurance [Abstract] |  |
Asbestos liability - current | $ (116.4) | $ (125.9)
Asbestos liability - non-current | (1,043.3) | (1,176.3)
Asbestos liability - Total | (1,159.7) | (1,302.2)
Insurance receivable - current | 5.7 | 16.7
Insurance receivable - non-current | 58.1 | 149.0
Insurance receivable - Total | 63.8 | 165.7
Workers' compensation asset - current | 2.9 | 4.1
Workers' compensation asset - non-current | 40.4 | 46.8
Workers' compensation liability - current | (2.9) | (4.1)
Workers' compensation liability - non-current | (40.4) | (46.8)
Workers' compensation - Total | 0.0 | 0.0
Loan facility | (52.4) | (50.7)
Other net liabilities | (1.6) | (1.0)
Restricted cash and cash equivalents of the AICF | 108.9 | 17.0
Net Unfunded AFFA liability | (1,041.0) | (1,171.2)
Deferred income taxes - non-current | 356.6 | 384.9
Income tax payable | 16.8 | 19.6
Net Unfunded AFFA liability, net of tax | $ (667.6) | $ (766.7)

X
- 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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Balance Type: | credit
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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
Name: | jhx_AsbestosFundLiabilityCurrent
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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
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X
- Definition Asbestos net liability in accordance with the Amended and Restated Final Funding Agreement. + References No definition available. + Details
Name: | jhx_AsbestosNetLiability
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Data Type: | xbrli:monetaryItemType
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- Definition Asbestos net liability in accordance with the Amended and Restated Final Funding Agreement, net of tax. + References No definition available. + Details
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X
- Definition Asbestos workers compensation assets liabilities net. + References No definition available. + Details
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X
- 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. + References No definition available. + Details
Name: | jhx_CurrentPortionOfLongTermDebtAsbestos
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- 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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X
- 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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Balance Type: | debit
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X
- 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
Namespace Prefix: | jhx_
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Balance Type: | debit
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X
- 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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X
- 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 The carrying amounts of cash and cash equivalent items which are restricted to the settlement of asbestos claims and payments of the operating costs of the Asbestos Injuries Compensation Fund. Amounts are classified as current as they are highly liquid. + 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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- References No definition available. + Details
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