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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Statement [Abstract]
Revenue	$ 942,050	$ 751,370	$ 624,692
Cost of sales	716,022	566,603	462,872
Gross profit	226,028	184,767	161,820
Selling, general, and administrative expenses	185,776	159,435	146,433
Income from operations	40,252	25,332	15,387
Interest expense	5,462	4,454	4,024
Income before income tax provision (benefit)	34,790	20,878	11,363
Income tax provision (benefit)	12,208	(27,414)	91
Net income	$ 22,582	$ 48,292	$ 11,272
Basic net income per common share	$ 0.93	$ 1.97	$ 0.47
Diluted net income per common share	$ 0.91	$ 1.92	$ 0.46
Weighted average number of common shares used in computing net income per common share:
Basic	24,203,947	24,466,243	23,916,238
Diluted	24,820,847	25,102,289	24,655,262

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