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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, 2017 USD ($) Claim | Mar. 31, 2016 USD ($) Claim | Mar. 31, 2015 USD ($) Claim | Mar. 31, 2014 USD ($) Claim | Mar. 31, 2013 USD ($) Claim | Mar. 31, 2017 AUD | Mar. 31, 2016 AUD | Mar. 31, 2015 AUD | Mar. 31, 2014 AUD | Mar. 31, 2013 AUD
Insurance [Abstract] |  |  |  |  |  |  |  |  |  |
Number of open claims at beginning of period | 426 | 494 | 466 | 462 | 592 |  |  |  |  |
Number of new claims | 557 | 577 | 665 | 608 | 542 |  |  |  |  |
Number of closed claims | 631 | 645 | 637 | 604 | 672 |  |  |  |  |
Number of open claims at end of period | 352 | 426 | 494 | 466 | 462 |  |  |  |  |
Average settlement amount per settled claim | $ 168,300 | $ 182,763 | $ 222,619 | $ 236,268 | $ 238,615 | AUD 223,535 | AUD 248,138 | AUD 254,209 | AUD 253,185 | AUD 231,313
Average settlement amount per case closed | $ 126,158 | $ 161,229 | $ 190,468 | $ 198,716 | $ 206,892 | AUD 167,563 | AUD 218,900 | AUD 217,495 | AUD 212,944 | AUD 200,561

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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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