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Segment Information (U.S. Government Related Sales by Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 3,324,249	$ 2,914,566	$ 2,382,790
Aerospace [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	2,028,618	1,768,103	1,519,322
Industrial [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	1,295,631	1,146,463	863,468
Direct Sales to U.S. Government [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	117,017	107,372	98,025
Direct Sales to U.S. Government [Member] | Aerospace [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	107,978	99,848	93,266
Direct Sales to U.S. Government [Member] | Industrial [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 9,039	$ 7,524	$ 4,759
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	3.00%	4.00%	4.00%
Indirect Sales to U.S. Government [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 453,643	$ 378,675	$ 439,698
Indirect Sales to U.S. Government [Member] | Aerospace [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	443,370	363,835	433,646
Indirect Sales to U.S. Government [Member] | Industrial [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 10,273	$ 14,840	$ 6,052
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	14.00%	13.00%	19.00%
U.S. Government Related [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 570,660	$ 486,047	$ 537,723
U.S. Government Related [Member] | Aerospace [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	551,348	463,683	526,912
U.S. Government Related [Member] | Industrial [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 19,312	$ 22,364	$ 10,811
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%	17.00%	23.00%

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