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The Incentive Stock Plans - Summary of Activity from Incentive Stock Plans (Detail) - USD ($)
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Options granted, Options Outstanding 10,000 5,000
Stock Options [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Shares Available for Grant, Beginning Balance 1,295,064  
Shares authorized, Shares Available for Grant 495,000  
Options granted, Shares Available for Grant (10,000)  
Restricted stock awards granted, Shares Available for Grant (574,132)  
Restricted stock awards forfeited, Shares Available for Grant 187,725  
Additional shares of stock issued, Shares Available for Grant (5,844)  
Shares Available for Grant, Ending Balance 1,387,813 1,295,064
Options Outstanding, Beginning Balance 35,000 30,750
Options granted, Options Outstanding 10,000  
Options exercised, Options Outstanding (5,750)  
Options Outstanding, Ending Balance 35,000 30,750
Exercisable as of September 30, 2025, Options Outstanding 26,665  
Aggregate Intrinsic Value $ 87,000 $ 296,000
Exercisable as of September 30 2025, Aggregate Intrinsic Value $ 82,000  
Weighted Average Exercise Price, Beginning Balance $ 28.8 $ 26.97
Options exercised, Weighted Average Exercise Price 19.02  
Weighted Average Exercise Price, Ending Balance 28.8 $ 26.97
Exercisable as of September 30 2025, Weighted Average Exercise Price $ 29.26  
Weighted Average Remaining Contractual Life 6 years 6 months 5 years
Exercisable as of September 30, 2025, Weighted Average Remaining Contractual Life 5 years 6 months