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The Incentive Stock Plans - Summary of Activity from Incentive Stock Plans (Detail) - Stock Options [Member] - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares Available for Grant, Beginning Balance 918,061  
Shares authorized, Shares Available for Grant 1,000,000  
Options cancelled/forfeited/expired, Shares Available for Grant 20,000  
Restricted stock awards granted, Shares Available for Grant (391,208)  
Restricted stock awards forfeited, Shares Available for Grant 13,684  
Additional shares of stock issued, Shares Available for Grant (24,443)  
Shares Available for Grant, Ending Balance 1,536,094 918,061
Options Outstanding, Beginning Balance 62,750 115,250
Options cancelled/forfeited/expired, Options Outstanding (20,000)  
Options exercised, Options Outstanding (32,500)  
Options Outstanding, Ending Balance 62,750 115,250
Exercisable as of September 30, 2022, Options Outstanding 60,083  
Aggregate Intrinsic Value $ 893 $ 4,085
Exercisable as of September 30 2022, Aggregate Intrinsic Value $ 870  
Weighted Average Exercise Price, Beginning Balance $ 17.62 $ 13.08
Options cancelled/forfeited/expired, Weighted Average Exercise Price 7.39  
Options exercised, Weighted Average Exercise Price 7.81  
Weighted Average Exercise Price, Ending Balance 17.62 $ 13.08
Exercisable as of September 30 2022, Weighted Average Exercise Price $ 16.93  
Weighted Average Remaining Contractual Life 2 years 3 months 18 days 1 year 10 months 24 days
Exercisable as of September 30, 2022, Weighted Average Remaining Contractual Life 2 years 2 months 12 days