Segment Information (U.S. Government Related Sales by Segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 2,245,832	$ 2,495,665	$ 2,900,197
Aerospace [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	1,404,117	1,590,963	1,880,520
Industrial [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	841,715	904,702	1,019,677
Direct Sales to U.S. Government [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	124,564	155,283	122,825
Direct Sales to U.S. Government [Member] | Aerospace [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	116,832	149,416	118,334
Direct Sales to U.S. Government [Member] | Industrial [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 7,732	$ 5,867	$ 4,491
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	6.00%	6.00%	4.00%
Indirect Sales to U.S. Government [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 528,560	$ 553,897	$ 559,116
Indirect Sales to U.S. Government [Member] | Aerospace [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	526,118	536,424	545,306
Indirect Sales to U.S. Government [Member] | Industrial [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 2,442	$ 17,473	$ 13,810
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	23.00%	22.00%	19.00%
U.S. Government Related [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 653,124	$ 709,180	$ 681,941
U.S. Government Related [Member] | Aerospace [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	642,950	685,840	663,640
U.S. Government Related [Member] | Industrial [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 10,174	$ 23,340	$ 18,301
U.S. Government Related [Member] | Sales [Member] | Product Concentration Risk [Member]
Entity Wide Revenue Major Customer [Line Items]
Percentage of attributable to revenue	29.00%	28.00%	23.00%