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The Incentive Stock Plans - Summary of Activity from Incentive Stock Plans (Detail) - USD ($)
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Options granted, Options Outstanding   5,000
Stock Options [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares Available for Grant, Beginning Balance 1,984,588  
Options granted, Shares Available for Grant (5,000)  
Options cancelled/forfeited/expired, Shares Available for Grant 21,000  
Restricted stock awards granted, Shares Available for Grant (726,903)  
Restricted stock awards forfeited, Shares Available for Grant 79,040  
Additional shares of stock issued, Shares Available for Grant (57,661)  
Shares Available for Grant, Ending Balance 1,295,064 1,984,588
Options Outstanding, Beginning Balance 30,750 54,750
Options granted, Options Outstanding 5,000  
Options cancelled/forfeited/expired, Options Outstanding (21,000)  
Options exercised, Options Outstanding (8,000)  
Options Outstanding, Ending Balance 30,750 54,750
Exercisable as of September 30, 2024, Options Outstanding 25,750  
Aggregate Intrinsic Value $ 296,000 $ 746,000
Exercisable as of September 30 2024, Aggregate Intrinsic Value $ 287,000  
Weighted Average Exercise Price, Beginning Balance $ 26.97 $ 20.96
Options cancelled/forfeited/expired, Weighted Average Exercise Price 15.8  
Options exercised, Weighted Average Exercise Price 16.01  
Weighted Average Exercise Price, Ending Balance 26.97 $ 20.96
Exercisable as of September 30 2024, Weighted Average Exercise Price $ 28.1  
Weighted Average Remaining Contractual Life 5 years 2 years 6 months
Exercisable as of September 30, 2024, Weighted Average Remaining Contractual Life 4 years 2 months 12 days