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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Income Statement [Abstract]      
Revenues $ 1,012,356 $ 699,308 $ 532,582
Cost of goods sold 739,268 551,755 447,564
Gross profit 273,088 147,553 85,018
Selling, general and administrative expenses 84,888 78,813 70,831
Research and development expenses 9,427 6,220 6,963
Operating income 178,773 62,520 7,224
Other expenses (income):      
Other income 0 0 (2,285)
Interest income, net (17,315) (6,430) (334)
Income before income taxes 196,088 68,950 9,843
Income tax provision (benefit) 46,240 14,425 (3,894)
Net income $ 149,848 $ 54,525 $ 13,737
Earnings per share:      
Basic (in dollars per share) $ 12.51 $ 4.59 $ 1.16
Diluted (in dollars per share) $ 12.29 $ 4.50 $ 1.15
Weighted average shares:      
Basic (in shares) 11,982 11,879 11,797
Diluted (in shares) 12,188 12,120 11,943
Dividends per share (in dollars per share) $ 1.0575 $ 1.0475 $ 1.0400