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Business Acquisition (Schedule of Unaudited Pro Forma Results) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Net sales	$ 652,811	$ 470,148
Net earnings	$ 49,120	$ 18,260
Basic earnings per share	$ 0.79	$ 0.30
Diluted earnings per share	$ 0.77	$ 0.29
Business Acquisition, Acquiree - L'Orange [Member]
Business Acquisition [Line Items]
Net sales	$ 87,680
Pro forma
Net sales	652,811	$ 565,993
Net earnings	$ 53,739	$ 20,999
Basic earnings per share	$ 0.87	$ 0.34
Diluted earnings per share	$ 0.84	$ 0.33

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