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, 2014
Mar. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Shares Available for Grant, Beginning balance 24,503,783 25,695,988
Granted (1,266,656) (1,415,605)
Forfeitures available for re-grant   223,400
Shares Available for Grant, Ending balance 23,237,127 24,503,783
Outstanding Options, Weighted Average Exercise Price, Beginning balance 7.94 7.59
Exercised, Outstanding Options, Weighted Average Exercise Price 7.89 7.01
Forfeited, Outstanding Options, Weighted Average Exercise Price   8.56
Outstanding Options, Weighted Average Exercise Price, Ending balance 8.11 7.94
Outstanding Options, Number, Beginning balance 5,156,136 9,085,140
Exercised, Outstanding Options, Number (4,056,860) (3,622,106)
Forfeited, Outstanding Options, Number   (306,898)
Outstanding Options, Number, Ending balance 1,099,276 5,156,136