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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, 2020 USD ($) claim | Mar. 31, 2019 USD ($) claim | Mar. 31, 2018 USD ($) claim | Mar. 31, 2017 USD ($) claim | Mar. 31, 2016 USD ($) claim | Mar. 31, 2020 AUD ($) | Mar. 31, 2019 AUD ($) | Mar. 31, 2018 AUD ($) | Mar. 31, 2017 AUD ($) | Mar. 31, 2016 AUD ($)
Loss Contingency, Pending Claims, Number [Roll Forward] |  |  |  |  |  |  |  |  |  |
Number of open claims at beginning of period | 332 | 336 | 352 | 426 | 494 |  |  |  |  |
Number of new claims | 657 | 568 | 562 | 557 | 577 |  |  |  |  |
Number of closed claims | 596 | 572 | 578 | 631 | 645 |  |  |  |  |
Number of open claims at end of period | 393 | 332 | 336 | 352 | 426 |  |  |  |  |
Average settlement amount per settled claim | $ 189,000 | $ 191,000 | $ 196,000 | $ 168,000 | $ 183,000 | $ 277,000 | $ 262,000 | $ 253,000 | $ 224,000 | $ 248,000
Average settlement amount per case closed | $ 167,000 | $ 171,000 | $ 168,000 | $ 126,000 | $ 161,000 | $ 245,000 | $ 234,000 | $ 217,000 | $ 168,000 | $ 219,000

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- Definition The number of claims settled and dismissed during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 + Details
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