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

Stock-Based Compensation - Restricted Stock Unit Activity (Detail)

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Stock-Based Compensation - Restricted Stock Unit Activity (Detail) - AUD / shares
12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Non-vested restricted stock units, Beginning balance 4,008,001 3,883,918
Granted, Restricted Stock Units 1,410,560 1,192,225
Vested, Restricted Stock Units (1,219,352) (774,675)
Forfeited, Restricted Stock Units (149,755) (293,467)
Non-vested restricted stock units, Ending balance 4,049,454 4,008,001
Weighted Average Fair Value at Grant Date, Non-vested, Beginning balance AUD 8.44 AUD 7.17
Weighted Average Fair Value at Grant Date, Granted 14.95 11.00
Weighted Average Fair Value at Grant Date, Vested 7.28 6.63
Weighted Average Fair Value at Grant Date, Forfeited 9.92 6.90
Weighted Average Fair Value at Grant Date, Non-vested, Ending balance AUD 11.00 AUD 8.44