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The Incentive Stock Plans - Incentive Stock Plans Option Activity (Detail) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares Available for Grant, Beginning Balance 829,854  
Options granted, Shares Available for Grant (5,000)  
Options cancelled/forfeited/expired, Shares Available for Grant 219,262  
Restricted stock awards granted, Shares Available for Grant (281,260)  
Restricted stock awards forfeited, Shares Available for Grant 11,500  
Additional shares of stock issued, Shares Available for Grant (42,253)  
Shares Available for Grant, Ending Balance 732,103 829,854
Options Outstanding, Beginning Balance 1,937,874  
Options granted, Options Outstanding 5,000  
Options cancelled/forfeited/expired, Options Outstanding (219,262)  
Options exercised, Options Outstanding (272,510)  
Options Outstanding, Ending Balance 1,451,102 1,937,874
Exercisable as of September 30, 2016, Options Outstanding 767,434  
Aggregate Intrinsic Value $ 12,397 $ 6,285
Exercisable as of September 30, 2016, Aggregate Intrinsic Value $ 9,064  
Weighted Average Exercise Price, Beginning Balance $ 12.95  
Options granted, Weighted Average Exercise Price 16.97  
Options cancelled/forfeited/expired, Weighted Average Exercise Price 24.70  
Options exercised, Weighted Average Exercise Price 6.89  
Weighted Average Exercise Price, Ending Balance 12.33 $ 12.95
Exercisable as of September 30, 2016, Weighted Average Exercise Price $ 9.21  
Weighted Average Remaining Contractual Life 6 years 6 years 6 months
Exercisable as of September 30, 2016, Weighted Average Remaining Contractual Life 4 years 9 months 18 days