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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, 2016
Mar. 31, 2015
Mar. 31, 2014
Options outstanding Number 104,027 511,780 1,099,276
Options outstanding, weighted average exercise price AUD 7.22 AUD 8.17 AUD 8.11
Options outstanding, aggregate intrinsic value AUD 1,106,360    
Options exercisable, Number 104,027    
Options exercisable, aggregate intrinsic value AUD 1,106,360    
Weighted Average Exercise Price 6.38 [Member]      
Exercise Price AUD 6.38    
Options outstanding Number 60,527    
Options outstanding, Weighted average remaining life 1 year 8 months 12 days    
Options outstanding, weighted average exercise price AUD 6.38    
Options outstanding, aggregate intrinsic value AUD 694,850    
Options exercisable, Number 60,527    
Options exercisable weighted average exercise price AUD 6.38    
Options exercisable, aggregate intrinsic value AUD 694,850    
Weighted Average Exercise Price 8.40 [Member]      
Exercise Price AUD 8.40    
Options outstanding Number 43,500    
Options outstanding, Weighted average remaining life 7 months 6 days    
Options outstanding, weighted average exercise price AUD 8.40    
Options outstanding, aggregate intrinsic value AUD 411,510    
Options exercisable, Number 43,500    
Options exercisable weighted average exercise price AUD 8.40    
Options exercisable, aggregate intrinsic value AUD 411,510