XML 105 R65.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Asbestos - Numbers of Open Claims, New Claims and Closed Claims and Average Settlement Per Settled Claim and Case Closed (Detail) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2016 USD ($) Claim | Mar. 31, 2015 USD ($) Claim | Mar. 31, 2014 USD ($) Claim | Mar. 31, 2013 USD ($) Claim | Mar. 31, 2012 USD ($) Claim | Mar. 31, 2016 AUD | Mar. 31, 2015 AUD | Mar. 31, 2014 AUD | Mar. 31, 2013 AUD | Mar. 31, 2012 AUD
Insurance [Abstract] |  |  |  |  |  |  |  |  |  |
Number of open claims at beginning of period | 494 | 466 | 462 | 592 | 564 |  |  |  |  |
Number of new claims | 577 | 665 | 608 | 542 | 456 |  |  |  |  |
Number of closed claims | 645 | 637 | 604 | 672 | 428 |  |  |  |  |
Number of open claims at end of period | 426 | 494 | 466 | 462 | 592 |  |  |  |  |
Average settlement amount per settled claim | $ 182,763 | $ 222,619 | $ 236,268 | $ 238,615 | $ 228,361 | AUD 248,138 | AUD 254,209 | AUD 253,185 | AUD 231,313 | AUD 218,610
Average settlement amount per case closed | $ 161,229 | $ 190,468 | $ 198,716 | $ 206,892 | $ 207,019 | AUD 218,900 | AUD 217,495 | AUD 212,944 | AUD 200,561 | AUD 198,179

X
- Definition Average settlement amount per case closed. + References No definition available. + Details
Name: | jhx_AverageSettlementAmountPerCaseClosed
Namespace Prefix: | jhx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Average settlement amount per settled claim. + References No definition available. + Details
Name: | jhx_AverageSettlementAmountPerSettledClaim
Namespace Prefix: | jhx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_InsuranceAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_LossContingencyClaimsSettledAndDismissedNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_LossContingencyNewClaimsFiledNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_LossContingencyPendingClaimsNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant