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Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Revenue	$ 270,605	$ 245,018	$ 507,526	$ 471,893
Cost of sales	201,312	183,959	378,984	357,696
Gross profit	69,293	61,059	128,542	114,197
Selling, general, and administrative expenses	58,659	54,781	108,905	101,876
Income from operations	10,634	6,278	19,637	12,321
Interest expense	2,840	2,045	5,382	3,614
Income before income tax provision	7,794	4,233	14,255	8,707
Income tax provision	1,610	1,484	3,859	3,315
Net income	$ 6,184	$ 2,749	$ 10,396	$ 5,392
Basic net income per common share	$ 0.28	$ 0.11	$ 0.47	$ 0.22
Diluted net income per common share	$ 0.27	$ 0.11	$ 0.46	$ 0.22
Weighted average number of common shares used in computing net income per common share:
Basic	22,173,194	24,293,764	22,079,065	24,271,880
Diluted	22,940,594	25,116,359	22,825,598	25,019,870

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