BUSINESS SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) segment	Jun. 30, 2022 USD ($)
BUSINESS SEGMENT INFORMATION
Net sales	$ 248,749	$ 219,066	$ 683,386	$ 601,004
EBIT	38,001	30,833	84,177	69,091
Less: Interest expense	(2,495)	(1,331)	(6,422)	(3,084)
Earnings before income taxes	35,506	29,502	$ 77,755	66,007
Number of reportable segments | segment			3
Aerospace & Defense
BUSINESS SEGMENT INFORMATION
Net sales	103,469	92,606	$ 285,434	247,671
EBIT	21,665	20,738	52,996	45,042
USG
BUSINESS SEGMENT INFORMATION
Net sales	89,966	67,201	240,172	194,877
EBIT	20,351	13,135	50,543	37,840
Test
BUSINESS SEGMENT INFORMATION
Net sales	55,314	59,259	157,780	158,456
EBIT	8,643	8,354	21,280	20,813
Corporate (loss)
BUSINESS SEGMENT INFORMATION
EBIT	$ (12,658)	$ (11,394)	$ (40,642)	$ (34,604)