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Business Acquisitions (Schedule of Unaudited Pro Forma Results) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Business Acquisition [Line Items]
Net sales	$ 588,117	$ 548,622	$ 1,606,514	$ 1,491,897
Net earnings	$ 49,117	$ 53,626	$ 105,866	$ 138,279
Basic earnings per share	$ 0.80	$ 0.87	$ 1.72	$ 2.25
Diluted earnings per share	$ 0.77	$ 0.85	$ 1.66	$ 2.18
Business Acquisition, Acquiree - L'Orange [Member]
Pro forma
Net earnings	$ 60,488	$ 53,071	$ 129,191	$ 108,190
Net sales	$ 639,665	$ 619,485	$ 1,830,515	$ 1,684,071
Basic earnings per share	$ 0.98	$ 0.87	$ 2.10	$ 1.76
Diluted earnings per share	$ 0.95	$ 0.84	$ 2.03	$ 1.70

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