Business Segment Information (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2022 USD ($) segment	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
BUSINESS SEGMENT INFORMATION
NET SALES	$ 857,502	$ 715,440	$ 730,471
EBIT	111,300	82,900	43,100
Less: Interest expense	(4,900)	(2,200)	(6,700)
Earnings before income taxes	$ 106,435	80,671	36,406
Number of reportable segments | segment	3
Corporate
BUSINESS SEGMENT INFORMATION
EBIT	$ (47,300)	(42,100)	(78,400)
Aerospace & Defense
BUSINESS SEGMENT INFORMATION
NET SALES	351,413	314,824	351,900
EBIT	68,400	56,500	69,900
USG
BUSINESS SEGMENT INFORMATION
NET SALES	278,367	202,908	191,700
EBIT	57,600	40,900	24,400
Test
BUSINESS SEGMENT INFORMATION
NET SALES	227,722	197,708	186,900
EBIT	$ 32,600	$ 27,600	$ 27,200