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The Incentive Stock Plans - Summary of Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Options granted, Options Outstanding 0   0
Stock Options [Member]      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares Available for Grant, Beginning Balance 1,047,247    
Options cancelled/forfeited/expired, Shares Available for Grant 7,917    
Restricted stock awards granted, Shares Available for Grant (326,324)    
Restricted stock awards forfeited, Shares Available for Grant 36,250    
Additional shares of stock issued, Shares Available for Grant (49,500)    
Shares Available for Grant, Ending Balance 715,590 1,047,247  
Options Outstanding, Beginning Balance 611,223    
Options cancelled/forfeited/expired, Options Outstanding (7,917)    
Options exercised, Options Outstanding (119,275)    
Options Outstanding, Ending Balance 484,031 611,223  
Exercisable as of September 30, 2019, Options Outstanding 482,364    
Aggregate Intrinsic Value $ 1,569 $ 5,544  
Exercisable as of September 30, 2019, Aggregate Intrinsic Value $ 1,569    
Weighted Average Exercise Price, Beginning Balance $ 12.18    
Options cancelled/forfeited/expired, Weighted Average Exercise Price 5.23    
Options exercised, Weighted Average Exercise Price 11.65    
Weighted Average Exercise Price, Ending Balance 12.42 $ 12.18  
Exercisable as of September 30, 2019, Weighted Average Exercise Price $ 12.40    
Weighted Average Remaining Contractual Life 3 years 8 months 12 days 4 years 4 months 24 days  
Exercisable as of September 30, 2019, Weighted Average Remaining Contractual Life 3 years 8 months 12 days