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Asbestos - Numbers of Open Claims, New Claims and Closed Claims and Average Settlement Per Settled Claim and Case Closed (Detail) | 12 Months Ended
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Mar. 31, 2015 USD ($) Claim | Mar. 31, 2015 AUD Claim | Mar. 31, 2014 USD ($) Claim | Mar. 31, 2014 AUD Claim | Mar. 31, 2013 USD ($) Claim | Mar. 31, 2013 AUD Claim | Mar. 31, 2012 USD ($) Claim | Mar. 31, 2012 AUD Claim | Mar. 31, 2011 USD ($) Claim | Mar. 31, 2011 AUD Claim
Insurance [Abstract] |  |  |  |  |  |  |  |  |  |
Number of open claims at beginning of period | 466 us-gaap_LossContingencyPendingClaimsNumber | 466 us-gaap_LossContingencyPendingClaimsNumber | 462 us-gaap_LossContingencyPendingClaimsNumber | 462 us-gaap_LossContingencyPendingClaimsNumber | 592 us-gaap_LossContingencyPendingClaimsNumber | 592 us-gaap_LossContingencyPendingClaimsNumber | 564 us-gaap_LossContingencyPendingClaimsNumber | 564 us-gaap_LossContingencyPendingClaimsNumber | 529 us-gaap_LossContingencyPendingClaimsNumber | 529 us-gaap_LossContingencyPendingClaimsNumber
Number of new claims | 665 us-gaap_LossContingencyNewClaimsFiledNumber | 665 us-gaap_LossContingencyNewClaimsFiledNumber | 608 us-gaap_LossContingencyNewClaimsFiledNumber | 608 us-gaap_LossContingencyNewClaimsFiledNumber | 542 us-gaap_LossContingencyNewClaimsFiledNumber | 542 us-gaap_LossContingencyNewClaimsFiledNumber | 456 us-gaap_LossContingencyNewClaimsFiledNumber | 456 us-gaap_LossContingencyNewClaimsFiledNumber | 494 us-gaap_LossContingencyNewClaimsFiledNumber | 494 us-gaap_LossContingencyNewClaimsFiledNumber
Number of closed claims | 637 us-gaap_LossContingencyClaimsSettledAndDismissedNumber | 637 us-gaap_LossContingencyClaimsSettledAndDismissedNumber | 604 us-gaap_LossContingencyClaimsSettledAndDismissedNumber | 604 us-gaap_LossContingencyClaimsSettledAndDismissedNumber | 672 us-gaap_LossContingencyClaimsSettledAndDismissedNumber | 672 us-gaap_LossContingencyClaimsSettledAndDismissedNumber | 428 us-gaap_LossContingencyClaimsSettledAndDismissedNumber | 428 us-gaap_LossContingencyClaimsSettledAndDismissedNumber | 459 us-gaap_LossContingencyClaimsSettledAndDismissedNumber | 459 us-gaap_LossContingencyClaimsSettledAndDismissedNumber
Number of open claims at end of period | 494 us-gaap_LossContingencyPendingClaimsNumber | 494 us-gaap_LossContingencyPendingClaimsNumber | 466 us-gaap_LossContingencyPendingClaimsNumber | 466 us-gaap_LossContingencyPendingClaimsNumber | 462 us-gaap_LossContingencyPendingClaimsNumber | 462 us-gaap_LossContingencyPendingClaimsNumber | 592 us-gaap_LossContingencyPendingClaimsNumber | 592 us-gaap_LossContingencyPendingClaimsNumber | 564 us-gaap_LossContingencyPendingClaimsNumber | 564 us-gaap_LossContingencyPendingClaimsNumber
Average settlement amount per settled claim | $ 222,619 jhx_AverageSettlementAmountPerSettledClaim | 254,209 jhx_AverageSettlementAmountPerSettledClaim | $ 236,268 jhx_AverageSettlementAmountPerSettledClaim | 253,185 jhx_AverageSettlementAmountPerSettledClaim | $ 238,615 jhx_AverageSettlementAmountPerSettledClaim | 231,313 jhx_AverageSettlementAmountPerSettledClaim | $ 228,361 jhx_AverageSettlementAmountPerSettledClaim | 218,610 jhx_AverageSettlementAmountPerSettledClaim | $ 193,090 jhx_AverageSettlementAmountPerSettledClaim | 204,366 jhx_AverageSettlementAmountPerSettledClaim
Average settlement amount per case closed | $ 190,468 jhx_AverageSettlementAmountPerCaseClosed | 217,495 jhx_AverageSettlementAmountPerCaseClosed | $ 198,716 jhx_AverageSettlementAmountPerCaseClosed | 212,944 jhx_AverageSettlementAmountPerCaseClosed | $ 206,892 jhx_AverageSettlementAmountPerCaseClosed | 200,561 jhx_AverageSettlementAmountPerCaseClosed | $ 207,019 jhx_AverageSettlementAmountPerCaseClosed | 198,179 jhx_AverageSettlementAmountPerCaseClosed | $ 163,642 jhx_AverageSettlementAmountPerCaseClosed | 173,199 jhx_AverageSettlementAmountPerCaseClosed

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- Definition Average settlement amount per settled claim. + References No definition available. + Details
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- Details
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- Definition The number of claims settled and dismissed during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
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- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
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- Definition Number of pending claims pertaining to a loss contingency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349 + Details
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