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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Revenue	$ 1,052,320	$ 942,050	$ 751,370
Cost of sales	787,005	716,022	566,603
Gross profit	265,315	226,028	184,767
Selling, general, and administrative expenses	220,026	185,776	159,435
Income from operations	45,289	40,252	25,332
Interest expense	7,481	5,462	4,454
Income before income tax provision (benefit)	37,808	34,790	20,878
Income tax provision (benefit)	14,261	12,208	(27,414)
Net income	$ 23,547	$ 22,582	$ 48,292
Basic net income per common share	$ 0.98	$ 0.93	$ 1.97
Diluted net income per common share	$ 0.95	$ 0.91	$ 1.92
Weighted average number of common shares used in computing net income per common share:
Basic	23,966,611	24,203,947	24,466,243
Diluted	24,678,800	24,820,847	25,102,289

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