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The Incentive Stock Plans - Summary of Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
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 715,590  
Common stock, shares authorized 1,000,000  
Restricted stock awards granted, Shares Available for Grant (477,271)  
Restricted stock awards forfeited, Shares Available for Grant 49,188  
Additional shares of stock issued, Shares Available for Grant (12,092)  
Shares Available for Grant, Ending Balance 1,275,415 715,590
Options Outstanding, Beginning Balance 484,031  
Options exercised, Options Outstanding (287,702)  
Options Outstanding, Ending Balance 196,329 484,031
Exercisable as of September 30, 2020, Options Outstanding 196,239  
Aggregate Intrinsic Value $ 2,636 $ 1,569
Exercisable as of September 30, 2020, Aggregate Intrinsic Value $ 2,636  
Weighted Average Exercise Price, Beginning Balance $ 12.42  
Options exercised, Weighted Average Exercise Price 12.63  
Weighted Average Exercise Price, Ending Balance 12.12 $ 12.42
Exercisable as of September 30, 2020, Weighted Average Exercise Price $ 12.12  
Weighted Average Remaining Contractual Life 2 years 6 months 3 years 8 months 12 days
Exercisable as of September 30, 2020, Weighted Average Remaining Contractual Life 2 years 6 months