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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Income Statement [Abstract]    
Revenues $ 241,431 $ 194,017
Cost of goods sold 181,907 145,823
Gross profit 59,524 48,194
Selling, general and administrative expenses 21,476 20,347
Research and development expenses 2,476 1,967
Operating income 35,572 25,880
Other expenses (income):    
Interest income, net (3,865) (3,998)
Income before income taxes 39,437 29,878
Income tax provision 4,674 5,793
Net income $ 34,763 $ 24,085
Earnings per share:    
Basic (in dollars per share) $ 2.89 $ 2.02
Diluted (in dollars per share) $ 2.86 $ 1.98
Weighted average shares:    
Basic (in shares) 12,037 11,941
Diluted (in shares) 12,152 12,174
Dividends per share (in dollars per share) $ 0.2650 $ 0.2625