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

Stock-Based Compensation - Summary of Stock Options Available for Grant and Outstanding Options Activity (Detail)

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Stock-Based Compensation - Summary of Stock Options Available for Grant and Outstanding Options Activity (Detail) (AUD)
 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares Available for Grant, Beginning balance 25,695,988 26,588,283
Granted (1,415,605) (1,303,209)
Forfeited      
Forfeitures available for re-grant 223,400 410,914
Shares Available for Grant, Ending balance 24,503,783 25,695,988
Outstanding Options, Weighted Average Exercise Price, Beginning balance 7.59 7.40
Exercised, Outstanding Options, Weighted Average Exercise Price 7.01 6.25
Forfeited, Outstanding Options, Weighted Average Exercise Price 8.56 7.76
Outstanding Options, Weighted Average Exercise Price, Ending balance 7.94 7.59
Outstanding Options, Number, Beginning balance 9,085,140 11,355,295
Exercised, Outstanding Options, Number (3,622,106) (1,682,841)
Forfeited, Outstanding Options, Number (306,898) (587,314)
Outstanding Options, Number, Ending balance 5,156,136 9,085,140