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v2.4.1.9

Income Taxes - Deferred Tax Assets and Liabilities (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Mar. 31, 2014
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Deferred tax assets: |  |
Asbestos liability | $ 405.2 jhx_DeferredTaxAssetsTaxDeferredExpenseAsbestosLiability | $ 471.8 jhx_DeferredTaxAssetsTaxDeferredExpenseAsbestosLiability
Other provisions and accruals | 46.3 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals | 52.5 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Net operating loss carryforwards | 17.0 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 12.8 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Foreign tax credit carryforwards | 107.0 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | 135.4 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Total deferred tax assets | 575.5 us-gaap_DeferredTaxAssetsGross | 672.5 us-gaap_DeferredTaxAssetsGross
Valuation allowance | (113.0)us-gaap_DeferredTaxAssetsValuationAllowance | (142.4)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets, net of valuation allowance | 462.5 us-gaap_DeferredTaxAssetsNet | 530.1 us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities: |  |
Depreciable and amortizable assets | (112.3)us-gaap_DeferredTaxLiabilitiesOtherFiniteLivedAssets | (111.2)us-gaap_DeferredTaxLiabilitiesOtherFiniteLivedAssets
Other | (3.7)us-gaap_DeferredTaxLiabilitiesOther | (6.9)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities | (116.0)us-gaap_DeferredTaxLiabilities | (118.1)us-gaap_DeferredTaxLiabilities
Net deferred tax assets | $ 346.5 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 412.0 us-gaap_DeferredTaxAssetsLiabilitiesNet

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- Definition The anticipated tax benefit available to the Company in future periods resulting from the Company's previous contributions to AICF in accordance with the Amended and Restated Final Funding Agreement (AFFA). + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Asset -URI http://asc.fasb.org/extlink&oid=6510090 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from reserves and accruals. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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