Business Segment Information - Schedule Of Capital Expenditures (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Capital Expenditures	$ 32,101	$ 26,705	$ 32,108
Goodwill	492,709	504,853	408,100
Aerospace & Defense
Capital Expenditures	9,400	10,400	15,900
Goodwill	110,000	104,300	102,100
USG
Capital Expenditures	14,400	11,600	12,400
Goodwill	348,700	366,500	271,900
Test
Capital Expenditures	8,300	4,700	3,600
Goodwill	34,000	34,100	34,100
Corporate
Capital Expenditures	$ 0	$ 0	$ 200