CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
CONSOLIDATED STATEMENTS OF OPERATIONS
Net revenues	$ 589,956	$ 490,461	$ 337,661
Cost of sales	480,196	384,128	297,931
Gross profit	109,760	106,333	39,730
Selling, general and administrative expense	48,028	47,089	43,470
Research and technical expense	4,126	3,822	3,403
Operating income (loss)	57,606	55,422	(7,143)
Nonoperating retirement benefit expense (income)	(1,834)	(4,655)	1,470
Interest income	(56)	(18)	(16)
Interest expense	7,594	2,481	1,186
Income (loss) before income taxes	51,902	57,614	(9,783)
Provision for (benefit from) income taxes	9,927	12,527	(1,100)
Net income (loss)	$ 41,975	$ 45,087	$ (8,683)
Net income (loss) per share:
Basic (dollars per share)	$ 3.31	$ 3.62	$ (0.71)
Diluted (dollars per share)	$ 3.26	$ 3.57	$ (0.71)
Weighted Average Common Shares Outstanding
Basic (in shares)	12,566,843	12,346,025	12,499,609
Diluted (in shares)	12,780,278	12,505,500	12,499,609
Dividends declared per common share (dollars per share)	$ 0.88	$ 0.88	$ 0.88