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Asbestos - Central Estimates, Net of Insurance Recoveries (Detail) In Millions, unless otherwise specified | Mar. 31, 2015 Discounted & Inflated [Member] USD ($) | Mar. 31, 2015 Discounted & Inflated [Member] AUD | Mar. 31, 2015 Undiscounted but Inflated [Member] USD ($) | Mar. 31, 2015 Undiscounted but Inflated [Member] AUD | Mar. 31, 2015 Undiscounted and Uninflated [Member] USD ($) | Mar. 31, 2015 Undiscounted and Uninflated [Member] AUD
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Asbestos Claims [Line Items] |  |  |  |  |  |
Central Estimate, net of insurance recoveries | $ 1,636 us-gaap_EstimatedInsuranceRecoveries / us-gaap_BusinessInterruptionLossAxis = jhx_DiscountedAndInflatedMember | 2,143 us-gaap_EstimatedInsuranceRecoveries / us-gaap_BusinessInterruptionLossAxis = jhx_DiscountedAndInflatedMember | $ 2,094 us-gaap_EstimatedInsuranceRecoveries / us-gaap_BusinessInterruptionLossAxis = jhx_UndiscountedButInflatedMember | 2,743 us-gaap_EstimatedInsuranceRecoveries / us-gaap_BusinessInterruptionLossAxis = jhx_UndiscountedButInflatedMember | $ 1,196 us-gaap_EstimatedInsuranceRecoveries / us-gaap_BusinessInterruptionLossAxis = jhx_UndiscountedAndUninflatedMember | 1,566 us-gaap_EstimatedInsuranceRecoveries / us-gaap_BusinessInterruptionLossAxis = jhx_UndiscountedAndUninflatedMember

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- Definition Carrying amount as of the balance sheet date of amounts expected to be recovered under the terms of insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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