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The Incentive Stock Plans - Summary of Activity from Incentive Stock Plans (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2021
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 1,275,415    
Options granted, Shares Available for Grant (5,000)    
Options cancelled/forfeited/expired, Shares Available for Grant 10,000    
Restricted stock awards granted, Shares Available for Grant (344,616)    
Restricted stock awards forfeited, Shares Available for Grant 6,325    
Additional shares of stock issued, Shares Available for Grant (24,063)    
Shares Available for Grant, Ending Balance 918,061 1,275,415  
Options Outstanding, Beginning Balance 196,329    
Options granted, Options Outstanding 5,000    
Options cancelled/forfeited/expired, Options Outstanding (10,000)    
Options exercised, Options Outstanding (76,079)    
Options Outstanding, Ending Balance 115,250 196,329  
Exercisable as of September 30, 2021, Options Outstanding 110,916    
Aggregate Intrinsic Value $ 4,085 $ 2,636  
Exercisable as of September 30, 2021, Aggregate Intrinsic Value $ 4,044    
Weighted Average Exercise Price, Beginning Balance $ 12.12    
Options granted, Weighted Average Exercise Price 48.52    
Options cancelled/forfeited/expired, Weighted Average Exercise Price 7.54    
Options exercised, Weighted Average Exercise Price 13.68    
Weighted Average Exercise Price, Ending Balance 13.08 $ 12.12  
Exercisable as of September 30, 2021, Weighted Average Exercise Price $ 12.06    
Weighted Average Remaining Contractual Life 1 year 10 months 24 days 2 years 6 months  
Exercisable as of September 30, 2021, Weighted Average Remaining Contractual Life 2 years