Segment Information (Summary of Consolidated Net Sales and Earnings by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Total net sales	$ 537,619	$ 720,355
Interest expense, net	(8,411)	(8,522)
Consolidated earnings before income taxes	47,584	61,548
Aerospace [Member]
Segment Reporting Information [Line Items]
Total net sales	321,667	473,925
Industrial [Member]
Segment Reporting Information [Line Items]
Total net sales	215,952	246,430
Operating Segments [Member] | Aerospace [Member]
Segment Reporting Information [Line Items]
Total net sales	321,667	473,925
Segment earnings (loss)	46,466	92,911
Operating Segments [Member] | Industrial [Member]
Segment Reporting Information [Line Items]
Total net sales	215,952	246,430
Segment earnings (loss)	32,888	28,230
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Segment earnings (loss)	$ (23,359)	$ (51,071)