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

Capital Management and Dividends - Additional Information (Detail)

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Capital Management and Dividends - Additional Information (Detail)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Mar. 31, 2014
USD ($)
Mar. 31, 2014
AUD
Mar. 31, 2013
Mar. 31, 2012
USD ($)
Mar. 31, 2014
Subsequent Event [Member]
USD ($)
Mar. 31, 2014
Subsequent Event [Member]
AUD
Mar. 31, 2014
Special Dividend [Member]
Subsequent Event [Member]
USD ($)
Dividends Payable [Line Items]              
Interim ordinary dividend to shareholders         $ 0.32   $ 0.20
Dividend, Payment Date         Aug. 08, 2014 Aug. 08, 2014 Aug. 08, 2014
Dividend, Record Date         Jun. 12, 2014 Jun. 12, 2014 Jun. 12, 2014
Aggregate number of shares acquired 1,900,000 1,900,000     715,000 715,000  
Aggregate cost of common stock $ 22.1 24.5   $ 19.0 $ 9.1 9.8  
Average price paid per share of common stock $ 11.64 12.92     $ 12.73 13.69  
Number of securities bought back     0        
Percentage of stock repurchase program authorized 5.00% 5.00%