Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Asbestos - Numbers of Open Claims, New Claims and Closed Claims and Average Settlement Per Settled Claim and Case Closed (Detail)

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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
Mar. 31, 2018
USD ($)
claim
Mar. 31, 2017
USD ($)
claim
Mar. 31, 2016
USD ($)
claim
Mar. 31, 2015
USD ($)
claim
Mar. 31, 2014
USD ($)
claim
Mar. 31, 2018
AUD ($)
Mar. 31, 2017
AUD ($)
Mar. 31, 2016
AUD ($)
Mar. 31, 2015
AUD ($)
Mar. 31, 2014
AUD ($)
Loss Contingency, Pending Claims, Number [Roll Forward]                    
Number of open claims at beginning of period 352 426 494 466 462          
Number of new claims 562 557 577 665 608          
Number of closed claims 578 631 645 637 604          
Number of open claims at end of period 336 352 426 494 466          
Average settlement amount per settled claim $ 196,093 $ 168,300 $ 182,763 $ 222,619 $ 236,268 $ 253,431 $ 223,535 $ 248,138 $ 254,209 $ 253,185
Average settlement amount per case closed $ 167,934 $ 126,158 $ 161,229 $ 190,468 $ 198,716 $ 217,038 $ 167,563 $ 218,900 $ 217,495 $ 212,944