Quarterly Results Quarterly Results (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 206,598	$ 166,059	$ 182,146	$ 145,383	$ 148,851	$ 142,021	$ 162,831	$ 132,371	$ 700,186	$ 586,074
Gross Profit	22,086	17,461	20,387	11,761	12,456	12,160	16,457	9,662	71,695	50,735
Operating Income	10,778	8,187	11,508	4,131	7,262	3,933	9,806	3,079	34,604	24,080
Provision for income taxes	3,605	2,213	3,686	1,101	3,218	1,150	3,351	1,262	10,605	8,981
Net income	$ 6,456	$ 5,282	$ 7,249	$ 2,583	$ 3,626	$ 2,416	$ 5,905	$ 1,579	$ 21,570	$ 13,526
Net income per basic share	$ 0.38	$ 0.31	$ 0.43	$ 0.15	$ 0.22	$ 0.14	$ 0.35	$ 0.09	$ 1.27	$ 0.80
Net income per share diluted share	$ 0.38	$ 0.31	$ 0.43	$ 0.15	$ 0.21	$ 0.14	$ 0.35	$ 0.09	$ 1.27	$ 0.80
Basic	16,999	17,007	16,998	16,988	16,857	16,856	16,844	16,765	16,982	16,813
Diluted	17,052	17,051	17,043	17,040	16,934	16,927	16,903	16,856	17,030	16,904