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Business Acquisition (Schedule of Unaudited Pro Forma Results) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Business Acquisition [Line Items]
Net sales	$ 752,005	$ 588,117	$ 2,163,660	$ 1,606,514
Net earnings	$ 66,107	$ 49,117	$ 192,806	$ 105,866
Basic earnings per share	$ 1.07	$ 0.80	$ 3.11	$ 1.72
Diluted earnings per share	$ 1.02	$ 0.77	$ 2.99	$ 1.66
Business Acquisition, Acquiree - L'Orange [Member]
Business Acquisition [Line Items]
Net sales	$ 78,517	$ 24,878	$ 254,183	$ 24,878
Pro forma
Net sales	752,005	639,665	2,163,660	1,830,515
Net earnings	$ 66,092	$ 66,372	$ 201,363	$ 134,976
Basic earnings per share	$ 1.07	$ 1.08	$ 3.25	$ 2.20
Diluted earnings per share	$ 1.02	$ 1.04	$ 3.12	$ 2.12

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