QUARTERLY FINANCIAL DATA (Unaudited) (Details) (USD $)	3 Months Ended									12 Months Ended
	Jul. 28, 2012	Apr. 28, 2012	Jan. 28, 2012	Oct. 29, 2011	Jul. 30, 2011	Apr. 30, 2011	Jan. 29, 2011	Oct. 30, 2010	Oct. 24, 2009	Jul. 28, 2012	Jul. 30, 2011	Jul. 31, 2010
Selected Quarterly Financial Information [Abstract]
Revenue	$ 318,034,000	$ 296,103,000	$ 267,407,000	$ 319,575,000	$ 303,719,000	$ 252,363,000	$ 218,203,000	$ 261,584,000		$ 1,201,119,000	$ 1,035,868,000	$ 988,623,000
Costs of earned revenues, excluding depreciation and amortization	252,137,000	241,386,000	220,239,000	255,187,000	239,132,000	207,045,000	181,621,000	209,322,000		968,949,000	837,119,000	810,064,000
Gross Profit	65,897,000	54,717,000	47,168,000	64,388,000	64,587,000	45,318,000	36,582,000	52,262,000
Net income	13,282,000	9,645,000	3,485,000	12,966,000	12,965,000	1,489,000	(5,094,000)	6,747,000		39,378,000	16,107,000	5,849,000
Earnings per common share - Basic: (in dollars per share)	$ 0.40	$ 0.29	$ 0.10	$ 0.39	$ 0.38	$ 0.04	$ (0.14)	$ 0.18		$ 1.17	$ 0.46	$ 0.15
Earnings per common share - Diluted: (in dollars per share)	$ 0.39	$ 0.28	$ 0.10	$ 0.38	$ 0.38	$ 0.04	$ (0.14)	$ 0.18		$ 1.14	$ 0.45	$ 0.15
Line of Credit Facility [Line Items]
Payments of Debt Extinguishment Costs						2,000,000	4,000,000
Long-term debt	187,574,000				187,806,000					187,574,000	187,806,000
Interest rate (in hundredths)	7.125%				8.125%					7.125%	8.125%
Legal settlements						600,000
Non-cash tax charge for valuation allowance									1,100,000
Write off of deferred debt issuance cost						600,000	1,700,000
Senior Subordinated Notes 2015 [Member]
Line of Credit Facility [Line Items]
Long-term debt												135,350,000
Interest rate (in hundredths)							8.125%
Write off of deferred debt issuance cost											$ 2,300,000