Segment Information (U.S. Government Related Sales by Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 2,914,566	$ 2,382,790	$ 2,245,832
Aerospace [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	1,768,103	1,519,322	1,404,117
Industrial [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	1,146,463	863,468	841,715
Direct Sales to U.S. Government [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	107,372	98,025	124,564
Direct Sales to U.S. Government [Member] | Aerospace [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	99,848	93,266	116,832
Direct Sales to U.S. Government [Member] | Industrial [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 7,524	$ 4,759	$ 7,732
Direct Sales to U.S. Government [Member] | Sales [Member] | Product Concentration Risk [Member]
Entity Wide Revenue Major Customer [Line Items]
Percentage of attributable to revenue	4.00%	4.00%	6.00%
Indirect Sales to U.S. Government [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 378,675	$ 439,698	$ 528,560
Indirect Sales to U.S. Government [Member] | Aerospace [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	363,835	433,646	526,118
Indirect Sales to U.S. Government [Member] | Industrial [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 14,840	$ 6,052	$ 2,442
Indirect Sales to U.S. Government [Member] | Sales [Member] | Product Concentration Risk [Member]
Entity Wide Revenue Major Customer [Line Items]
Percentage of attributable to revenue	13.00%	19.00%	23.00%
U.S. Government Related [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 486,047	$ 537,723	$ 653,124
U.S. Government Related [Member] | Aerospace [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	463,683	526,912	642,950
U.S. Government Related [Member] | Industrial [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 22,364	$ 10,811	$ 10,174
U.S. Government Related [Member] | Sales [Member] | Product Concentration Risk [Member]
Entity Wide Revenue Major Customer [Line Items]
Percentage of attributable to revenue	17.00%	23.00%	29.00%