COMMITMENTS AND CONTINGENCIES (Details) (USD $)	3 Months Ended	12 Months Ended				3 Months Ended
	Apr. 30, 2011	Jul. 28, 2012	Jul. 30, 2011	Jul. 31, 2010	Jul. 28, 2012 Non Affiliated Entity [Member]	Jan. 28, 2012 Wage and Hour claim Disputes [Member] Prince Telecom LLC [Member]	Apr. 30, 2011 Wage and Hour claim Disputes [Member] Prince Telecom LLC [Member]
Loss Contingencies [Line Items]
Number of plaintiffs in lawsuit			2
Loss contingency accrual							$ 600,000
Letters of Credit Outstanding, Amount		38,500,000
Legal settlements	600,000					600,000
Operating leases, rent expense for leases less than one year		9,900,000	6,700,000	6,000,000
Operating leases rent expense for leases greater than one year		10,600,000	9,400,000	10,100,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2013					7,636,000
2014					5,567,000
2015					3,661,000
2016					2,351,000
2017					1,291,000
Thereafter					2,109,000
Total future minimum lease payments					22,615,000
Oustanding performance and other surety contract bonds		$ 224,800,000
Number of class action lawsuits			2