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

Commitments and Contingencies - Additional Information (Detail)

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Commitments and Contingencies - Additional Information (Detail)
 12 Months Ended 12 Months Ended
Mar. 31, 2013
USD ($)
Mar. 31, 2012
USD ($)
Mar. 31, 2011
USD ($)
Mar. 31, 2013
NZD
Dec. 17, 2010
Sep. 30, 2010
USD ($)
Mar. 31, 2013
Five non-executive directors [Member]
AUD
Mar. 31, 2013
Two non-executive directors [Member]
AUD
Mar. 31, 2013
Former officer [Member]
AUD
Future Minimum Payments Under Non Cancelable Operating Leases With Initial Terms Of One Year Or More [Line Items]                  
Litigation settlement           $ 10,300,000      
Litigation settlement percentage of costs payable         90.00%        
Payment of penalty by officers             25,000 20,000 75,000
Provision made under indemnities 2,000,000                
Net of estimated recoveries from third-party 15,200,000                
Expenses related to legacy New Zealand product liability claims 13,200,000                
Legacy claims could result in additional loss 10,000,000                
Potential exposure on specified contingency       1,500,000,000          
Rental expense 16,200,000 16,000,000 15,300,000            
Acquisition of plant and equipment and other purchase obligations $ 0