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Estimated Compensation Expenses For RSU Award (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Compensation cost (included in operating expenses) $ 253 $ 217
Tax benefit recognized 64 40
Net compensation cost 189 177
Restricted Stock Units
   
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Compensation cost (included in operating expenses) 36  
Tax benefit recognized 14  
Net compensation cost 22  
Total compensation cost for non-vested awards not yet recognized $ 1,156  
Weighted-average years to be recognized 1 year 9 months 18 days