Segment Information (Summary of Consolidated Total Assets, Depreciation and Amortization, and Capital Expenditures by Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Consolidated total assets	$ 4,010,203	$ 3,806,446	$ 4,091,004
Property, plant and equipment, net	913,094	910,472
Depreciation and amortization	119,743	120,628	129,524
Capital expenditures	76,500	52,868	37,689
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	104,962	111,760	106,014
Other assets	585,490	540,386	832,734
Depreciation and amortization	8,696	9,868	10,564
Capital expenditures	(2,268)	17,216	5,222
Aerospace [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated total assets	1,829,410	1,773,854	1,698,833
Depreciation and amortization	59,880	60,176	62,075
Capital expenditures	56,913	23,253	17,303
Industrial [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Consolidated total assets	1,490,341	1,380,446	1,453,423
Depreciation and amortization	51,167	50,584	56,885
Capital expenditures	$ 21,855	$ 12,399	$ 15,164