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The Incentive Stock Plans - Summary of Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Options granted, Options Outstanding 0  
Stock Options [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares Available for Grant, Beginning Balance 732,103  
Options authorized, Shares Available for Grant 1,000,000  
Options cancelled/forfeited/expired, Shares Available for Grant 58,667  
Restricted stock awards granted, Shares Available for Grant (358,342)  
Restricted stock awards forfeited, Shares Available for Grant 8,000  
Additional shares of stock issued, Shares Available for Grant (53,867)  
Shares Available for Grant, Ending Balance 1,386,561 732,103
Options Outstanding, Beginning Balance 1,451,102  
Options cancelled/forfeited/expired, Options Outstanding (58,667)  
Options exercised, Options Outstanding (184,931)  
Options Outstanding, Ending Balance 1,207,504 1,451,102
Exercisable as of September 30, 2017, Options Outstanding 961,837  
Aggregate Intrinsic Value $ 5,737 $ 12,397
Exercisable as of September 30, 2017, Aggregate Intrinsic Value $ 5,566  
Weighted Average Exercise Price, Beginning Balance $ 12.33  
Options cancelled/forfeited/expired, Weighted Average Exercise Price 23.00  
Options exercised, Weighted Average Exercise Price 12.28  
Weighted Average Exercise Price, Ending Balance 11.81 $ 12.33
Exercisable as of September 30, 2017, Weighted Average Exercise Price $ 10.78  
Weighted Average Remaining Contractual Life 5 years 3 months 19 days 6 years
Exercisable as of September 30, 2017, Weighted Average Remaining Contractual Life 4 years 10 months 25 days