Segment Information (Summary of Consolidated Net Sales and Earnings by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Total net sales	$ 835,343	$ 718,214	$ 1,622,073	$ 1,336,833
Interest expense, net	(10,237)	(12,337)	(20,200)	(23,113)
Consolidated earnings before income taxes	120,624	40,241	230,344	71,990
Aerospace [Member]
Segment Reporting Information [Line Items]
Total net sales	497,512	437,017	958,268	832,702
Industrial [Member]
Segment Reporting Information [Line Items]
Total net sales	337,831	281,197	663,805	504,131
Operating Segments [Member] | Aerospace [Member]
Segment Reporting Information [Line Items]
Total net sales	497,512	437,017	958,268	832,702
Segment earnings (loss)	98,451	73,314	177,453	128,748
Operating Segments [Member] | Industrial [Member]
Segment Reporting Information [Line Items]
Total net sales	337,831	37,571	663,805	504,131
Segment earnings (loss)	65,244	281,197	132,125	48,973
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Segment earnings (loss)	$ (32,834)	$ (58,307)	$ (59,034)	$ (82,618)