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 (Parenthetical) (Detail)

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Asbestos - Numbers of Open Claims, New Claims and Closed Claims and Average Settlement Per Settled Claim and Case Closed (Parenthetical) (Detail) (USD $)
 12 Months Ended
Mar. 31, 2013
Claim
Asbestos Claims [Line Items]  
Number of claims closed 672
Number of claims settled 153
Number of closed claims 519
Settlement amounts