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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, 2023
Sep. 30, 2022
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Options granted, Options Outstanding 5,000 0
Stock Options [Member]    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Shares Available for Grant, Beginning Balance 1,536,094  
Shares authorized, Shares Available for Grant 1,300,000  
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 (825,573)  
Restricted stock awards forfeited, Shares Available for Grant 20,445  
Additional shares of stock issued, Shares Available for Grant (51,378)  
Shares Available for Grant, Ending Balance 1,984,588 1,536,094
Options Outstanding, Beginning Balance 54,750 62,750
Options granted, Options Outstanding 5,000  
Options cancelled/forfeited/expired, Options Outstanding (10,000)  
Options exercised, Options Outstanding (3,000)  
Options Outstanding, Ending Balance 54,750 62,750
Exercisable as of September 30, 2023, Options Outstanding 51,416  
Aggregate Intrinsic Value $ 746 $ 893
Exercisable as of September 30 2023, Aggregate Intrinsic Value $ 705  
Weighted Average Exercise Price, Beginning Balance $ 20.96 $ 17.62
Options granted, Weighted Average Exercise Price 31.2  
Options cancelled/forfeited/expired, Weighted Average Exercise Price 7.48  
Options exercised, Weighted Average Exercise Price 13.06  
Weighted Average Exercise Price, Ending Balance 20.96 $ 17.62
Exercisable as of September 30 2023, Weighted Average Exercise Price $ 20.3  
Weighted Average Remaining Contractual Life 2 years 6 months 2 years 3 months 18 days
Options granted, Weighted Average Remaining Contractual Life 2 years  
Exercisable as of September 30, 2023, Weighted Average Remaining Contractual Life 2 years 1 month 6 days