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, 2017
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options Outstanding, Weighted Average Exercise Price, and Additional Disclosures [Abstract]      
Exercise Price AUD 6.38    
Options outstanding Number 48,896 104,027 511,780
Options outstanding, Weighted average remaining life 8 months 12 days    
Options outstanding, weighted average exercise price AUD 6.38 AUD 7.22 AUD 8.17
Options outstanding, aggregate intrinsic value AUD 693,834