Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Revenues	$ 192,365	$ 135,483	$ 490,667	$ 369,907
Cost of goods sold	149,695	116,424	395,096	318,329
Gross profit	42,670	19,059	95,571	51,578
Selling, general and administrative expenses	19,691	16,404	58,384	49,374
Research and development expenses	1,427	1,806	4,471	5,342
Operating income (loss)	21,552	849	32,716	(3,138)
Other income	0	(2,006)	0	(2,285)
Interest income, net	(2,093)	(63)	(3,516)	(79)
Income (loss) before income taxes	23,645	2,918	36,232	(774)
Income tax provision (benefit)	5,191	(6,143)	8,142	(5,772)
Net income	$ 18,454	$ 9,061	$ 28,090	$ 4,998
Earnings per share:
Basic (in dollars per share)	$ 1.55	$ 0.77	$ 2.37	$ 0.42
Diluted (in dollars per share)	$ 1.52	$ 0.76	$ 2.32	$ 0.42
Weighted average shares:
Basic (in shares)	11,889	11,810	11,876	11,792
Diluted (in shares)	12,140	11,901	12,106	11,877
Dividends per share (in dollars per share)	$ 0.26	$ 0.26	$ 0.79	$ 0.78