Segment Information (Summary of Consolidated Net Sales and Earnings by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Total net sales	$ 556,675	$ 523,826	$ 1,675,615	$ 1,964,401
Interest expense, net	(8,089)	(8,360)	(24,466)	(25,162)
Consolidated earnings before income taxes	58,698	45,016	184,769	213,763
Aerospace [Member]
Segment Reporting Information [Line Items]
Total net sales	340,912	306,494	1,027,285	1,254,655
Industrial [Member]
Segment Reporting Information [Line Items]
Total net sales	215,763	217,332	648,330	709,746
Operating Segments [Member] | Aerospace [Member]
Segment Reporting Information [Line Items]
Total net sales	340,912	306,494	1,027,285	1,254,655
Segment earnings (loss)	53,167	41,096	168,641	251,645
Operating Segments [Member] | Industrial [Member]
Segment Reporting Information [Line Items]
Total net sales	215,763	217,332	648,330	709,746
Segment earnings (loss)	27,166	27,438	87,925	81,640
Unallocated Corporate [Member]
Segment Reporting Information [Line Items]
Segment earnings (loss)	$ (13,546)	$ (15,158)	$ (47,331)	$ (94,360)