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The Incentive Stock Plans - Incentive Stock Plans Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Jun. 30, 2015
Sep. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Restricted stock awards issued, Shares Available for Grant (111,000)  
Stock Options [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares Available for Grant, Beginning Balance 1,350,709  
Options granted, Shares Available for Grant (290,000)  
Options cancelled/forfeited/expired, Shares Available for Grant 84,780  
Restricted stock awards issued, Shares Available for Grant (111,000)  
Shares Available for Grant, Ending Balance 1,034,489 1,350,709
Options Outstanding, Beginning Balance   2,226,319
Options granted, Options Outstanding 290,000  
Options cancelled/forfeited/expired, Options Outstanding (84,780)  
Options exercised, Options Outstanding (471,211)  
Options Outstanding, Ending Balance 1,960,328  
Exercisable as of June 30, 2015, Options Outstanding 1,127,444  
Aggregate Intrinsic Value, Beginning Balance $ 15,980  
Aggregate Intrinsic Value, Ending Balance 19,807 $ 15,980
Exercisable at June 30, 2015, Aggregate Intrinsic Value $ 13,788  
Weighted Average Exercise Price, Beginning Balance $ 11.70  
Options granted, Weighted Average Exercise Price 15.91  
Options cancelled/forfeited/expired, Weighted Average Exercise Price 25.53  
Options exercised, Weighted Average Exercise Price 6.37  
Weighted Average Exercise Price, Ending Balance 13.00 $ 11.70
Exercisable at June 30, 2015, Weighted Average Exercise Price $ 11.30  
Weighted Average Remaining Contractual Life 6 years 8 months 12 days 6 years 7 months 6 days
Exercisable as of June 30, 2015, Weighted Average Remaining Contractual Life 5 years 3 months 18 days