Quarterly Results Quarterly Results (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 148,851	$ 142,021	$ 162,831	$ 132,371	$ 143,716	$ 128,191	$ 137,046	$ 108,790	$ 586,074	$ 517,743
Gross Profit	12,456	12,160	16,457	9,662	11,746	9,249	11,596	6,345	50,735	38,936
Operating Income (Loss)	7,262	3,933	9,806	3,079	4,612	3,175	5,777	1,268	24,080	14,832
Net income	$ 3,626	$ 2,416	$ 5,905	$ 1,579	$ 2,198	$ 1,691	$ 3,449	$ 507	$ 13,526	$ 7,845
Net income per basic share	$ 0.22	$ 0.14	$ 0.35	$ 0.09	$ 0.13	$ 0.10	$ 0.21	$ 0.03	$ 0.80	$ 0.47
Net income per share diluted share	$ 0.21	$ 0.14	$ 0.35	$ 0.09	$ 0.13	$ 0.10	$ 0.20	$ 0.03	$ 0.80	$ 0.47
Basic	16,857	16,856	16,844	16,765	16,760	16,753	16,729	16,634	16,813	16,716
Diluted	16,934	16,927	16,903	16,856	16,842	16,863	16,868	16,847	16,904	16,859