Business Segment Information (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2024 USD ($) segment	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Business Segment Information
Net sales	$ 1,026,759	$ 956,033	$ 857,502
Consolidated EBIT	145,100	127,700	111,300
Less: Interest expense	(15,200)	(8,800)	(4,900)
Earnings before income taxes	$ 129,889	118,947	106,435
Number of reportable segments | segment	3
Corporate
Business Segment Information
Consolidated EBIT	$ (54,100)	(53,000)	(47,300)
A&D
Business Segment Information
Net sales	448,175	392,443	351,400
A&D | Operating Segments
Business Segment Information
Consolidated EBIT	84,700	71,600	68,400
USG
Business Segment Information
Net sales	369,061	342,320	278,400
USG | Operating Segments
Business Segment Information
Consolidated EBIT	85,900	76,700	57,600
Test
Business Segment Information
Net sales	209,523	221,270	227,700
Test | Operating Segments
Business Segment Information
Consolidated EBIT	$ 28,600	$ 32,400	$ 32,600