Business Segment Information (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2023 USD ($) segment	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Business Segment Information
Net sales	$ 956,033	$ 857,502	$ 715,440
EBIT	127,700	111,300	82,900
Less: Interest expense	(8,800)	(4,900)	(2,200)
Earnings before income taxes	$ 118,947	106,435	80,671
Number of reportable segments | segment	3
Corporate
Business Segment Information
EBIT	$ (53,000)	(47,300)	(42,100)
A&D
Business Segment Information
Net sales	392,443	351,413	314,800
A&D | Operating Segments [Member]
Business Segment Information
EBIT	71,600	68,400	56,500
USG
Business Segment Information
Net sales	342,320	278,367	202,900
USG | Operating Segments [Member]
Business Segment Information
EBIT	76,700	57,600	40,900
Test
Business Segment Information
Net sales	221,270	227,722	197,700
Test | Operating Segments [Member]
Business Segment Information
EBIT	$ 32,400	$ 32,600	$ 27,600