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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Income/(Loss)
Beginning balance (in shares) at Sep. 30, 2022   12,588,000        
Beginning balance, Treasury stock (in shares) at Sep. 30, 2022         (806,000)  
Beginning balance at Sep. 30, 2022 $ 297,206 $ 126 $ 67,439 $ 283,638 $ (24,999) $ (28,998)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 54,525     54,525    
Foreign currency translation adjustments 1,915         1,915
Stock-based compensation (in shares)   80,000        
Stock-based compensation 4,599 $ 1 4,598      
Shares withheld in lieu of employee tax withholding (652)   (652)      
Dividends (12,741)   141 (12,882)    
Gain on cash flow commodity hedge 325         325
Postretirement benefit adjustment, net of tax (151)         (151)
Ending balance (in shares) at Sep. 30, 2023   12,668,000        
Ending balance, Treasury stock (in shares) at Sep. 30, 2023         (806,000)  
Ending balance at Sep. 30, 2023 345,026 $ 127 71,526 325,281 $ (24,999) (26,909)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 149,848     149,848    
Foreign currency translation adjustments 2,561         2,561
Stock-based compensation (in shares)   127,000        
Stock-based compensation 4,747 $ 1 4,746      
Shares withheld in lieu of employee tax withholding (6,599)   (6,599)      
Dividends (12,497)   438 (12,935)    
Gain on cash flow commodity hedge 0          
Postretirement benefit adjustment, net of tax $ (13)         (13)
Ending balance (in shares) at Sep. 30, 2024 11,989,238 12,795,000        
Ending balance, Treasury stock (in shares) at Sep. 30, 2024 (806,018)       (806,000)  
Ending balance at Sep. 30, 2024 $ 483,073 $ 128 70,111 462,194 $ (24,999) (24,361)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 180,747     180,747    
Foreign currency translation adjustments (2,598)         (2,598)
Stock-based compensation (in shares)   81,000        
Stock-based compensation 4,635 $ 1 4,634      
Shares withheld in lieu of employee tax withholding (12,248)   (12,248)      
Dividends (12,756)   337 (13,093)    
Gain on cash flow commodity hedge 0          
Postretirement benefit adjustment, net of tax $ (83)         (83)
Ending balance (in shares) at Sep. 30, 2025 12,070,178 12,876,000        
Ending balance, Treasury stock (in shares) at Sep. 30, 2025 (806,018)       (806,000)  
Ending balance at Sep. 30, 2025 $ 640,770 $ 129 $ 62,834 $ 629,848 $ (24,999) $ (27,042)