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Segment Information (U.S. Government Related Sales by Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 3,567,064	$ 3,324,249	$ 2,914,566
Aerospace [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	2,312,806	2,028,618	1,768,103
Industrial [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	1,254,258	1,295,631	1,146,463
Direct Sales to U.S. Government [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	102,050	117,017	107,372
Direct Sales to U.S. Government [Member] | Aerospace [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	95,147	107,978	99,848
Direct Sales to U.S. Government [Member] | Industrial [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 6,903	$ 9,039	$ 7,524
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%	3.00%	4.00%
Indirect Sales to U.S. Government [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 615,559	$ 453,643	$ 378,675
Indirect Sales to U.S. Government [Member] | Aerospace [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	598,254	443,370	363,835
Indirect Sales to U.S. Government [Member] | Industrial [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 17,305	$ 10,273	$ 14,840
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	17.00%	14.00%	13.00%
U.S. Government Related [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 717,609	$ 570,660	$ 486,047
U.S. Government Related [Member] | Aerospace [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	693,401	551,348	463,683
U.S. Government Related [Member] | Industrial [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 24,208	$ 19,312	$ 22,364
U.S. Government Related [Member] | Sales [Member] | Product Concentration Risk [Member]
Entity Wide Revenue Major Customer [Line Items]
Percentage of attributable to revenue	20.00%	17.00%	17.00%

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