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Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Revenue	$ 236,921	$ 226,875
Cost of sales	177,672	173,737
Gross profit	59,249	53,138
Selling, general, and administrative expenses	50,246	47,095
Income from operations	9,003	6,043
Interest expense	2,542	1,569
Income before income tax provision	6,461	4,474
Income tax provision	2,249	1,831
Net income	$ 4,212	$ 2,643
Basic net income per common share	$ 0.19	$ 0.11
Diluted net income per common share	$ 0.19	$ 0.11
Weighted average number of common shares used in computing net income per common share:
Basic	21,986,981	24,249,739
Diluted	22,712,648	24,923,125

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