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Estimated Compensation Expenses For RSU Award (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Compensation cost (included in operating expenses) $ 369 $ 320
Tax benefit recognized 93 63
Net compensation cost 276 257
Restricted Stock Units
   
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Compensation cost (included in operating expenses) 298  
Tax benefit recognized 119  
Net compensation cost 179  
Total compensation cost for non-vested awards not yet recognized $ 1,486  
Weighted-average years to be recognized 1 year 6 months 0 years