BUSINESS SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2023 USD ($) segment	Mar. 31, 2022 USD ($)
BUSINESS SEGMENT INFORMATION
Net sales	$ 229,136	$ 204,928	$ 434,637	$ 381,938
EBIT	25,619	22,688	46,176	38,258
Less: Interest expense	(2,269)	(1,020)	(3,927)	(1,753)
Earnings before income taxes	23,350	21,668	$ 42,249	36,505
Number of reportable segments | segment			3
Aerospace & Defense
BUSINESS SEGMENT INFORMATION
Net sales	98,982	84,821	$ 181,965	155,065
EBIT	18,795	14,349	31,331	24,304
USG
BUSINESS SEGMENT INFORMATION
Net sales	79,161	64,191	150,206	127,676
EBIT	14,061	11,314	30,192	24,705
Test
BUSINESS SEGMENT INFORMATION
Net sales	50,993	55,916	102,466	99,197
EBIT	7,226	8,494	12,637	12,459
Corporate (loss)
BUSINESS SEGMENT INFORMATION
EBIT	$ (14,463)	$ (11,469)	$ (27,984)	$ (23,210)