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The Incentive Stock Plans - Summary of Activity from Incentive Stock Plans (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2025
Mar. 31, 2024
Sep. 30, 2024
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   1,295,064    
Shares authorized, Shares Available for Grant   495,000    
Restricted stock awards granted, Shares Available for Grant   (560,046)    
Restricted stock awards forfeited, Shares Available for Grant   20,143    
Additional shares of stock issued, Shares Available for Grant   (3,152)    
Shares Available for Grant, Ending Balance 1,247,009 1,247,009   1,295,064
Options Outstanding, Beginning Balance   30,750    
Options exercised, Options Outstanding   (5,750)    
Options Outstanding, Ending Balance 25,000 25,000   30,750
Exercisable as of March 31, 2025, Options Outstanding 21,666 21,666    
Aggregate Intrinsic Value $ 41 $ 41   $ 296
Exercisable as of March 31, 2025, Aggregate Intrinsic Value $ 41 $ 41    
Weighted Average Exercise Price, Beginning Balance   $ 26.97    
Options exercised, Weighted Average Exercise Price   19.02    
Weighted Average Exercise Price, Ending Balance $ 30.19 30.19   $ 26.97
Exercisable as of March 31, 2025, Weighted Average Exercise Price $ 29.4 $ 29.4    
Weighted Average Remaining Contractual Life 5 years 8 months 12 days     5 years
Exercisable as of March 31, 2025, Weighted Average Remaining Contractual Life   5 years 1 month 6 days