Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Income Statement [Abstract]
Revenue	$ 214,401	$ 175,756	$ 460,607	$ 434,815
Cost of sales	160,195	128,949	341,705	324,080
Gross profit	54,206	46,807	118,902	110,735
Selling, general, and administrative expenses	41,652	33,047	109,609	98,591
Income from operations	12,554	13,760	9,293	12,144
Interest expense	1,051	1,193	3,138	3,355
Income before income tax benefit	11,503	12,567	6,155	8,789
Income tax benefit		1,070		1,029
Net income	$ 11,503	$ 13,637	$ 6,155	$ 9,818
Basic net income per common share	$ 0.48	$ 0.58	$ 0.26	$ 0.42
Diluted net income per common share	$ 0.47	$ 0.56	$ 0.25	$ 0.41
Weighted average number of common shares used in computing net income per common share:
Basic	24,012,991	23,388,384	23,857,606	23,176,664
Diluted	24,719,369	24,177,020	24,601,712	23,914,763