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

Stock-Based Compensation - Outstanding and Exercisable Options under 2001 Equity Incentive Plan and Long-Term Incentive Plan (Detail)

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Stock-Based Compensation - Outstanding and Exercisable Options under 2001 Equity Incentive Plan and Long-Term Incentive Plan (Detail) (AUD)
 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2014
Weighted Average Exercise Price 5.99 [Member]
Mar. 31, 2014
Weighted Average Exercise Price 6.38 [Member]
Mar. 31, 2014
Weighted Average Exercise Price 8.40 [Member]
Mar. 31, 2014
Weighted Average Exercise Price 8.40 [Member]
Mar. 31, 2014
Weighted Average Exercise Price 8.90 [Member]
Mar. 31, 2014
Weighted Average Exercise Price 8.90 [Member]
Exercise Price       5.99 6.38 8.40 8.40 8.90 8.90
Options outstanding Number 1,099,276 5,156,136 9,085,140 47,500 200,896 337,880 101,000 394,900 17,100
Options outstanding, Weighted average remaining life       8 months 12 days 3 years 8 months 12 days 2 years 7 months 6 days 2 years 7 months 6 days 1 year 8 months 12 days 1 year 8 months 12 days
Options outstanding, weighted average exercise price 8.11 7.94 7.59 5.99 6.38 8.40 8.40 8.90 8.90
Options outstanding, aggregate intrinsic value 6,832,991     396,150 1,597,123 2,003,628 598,930 2,144,307 92,853
Options exercisable, Number 1,099,276     47,500 200,896 337,880 101,000 394,900 17,100
Options exercisable weighted average exercise price       5.99 6.38 8.40 8.40 8.90 8.90
Options exercisable, aggregate intrinsic value 6,832,991     396,150 1,597,123 2,003,628 598,930 2,144,307 92,853