SECONDARY COMMON STOCK OFFERING (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Oct. 30, 2010	Jul. 30, 2011	Jul. 31, 2010
SECONDARY COMMON STOCK OFFERING
Issuance of common stock pursuant to secondary offering, including shares issued to cover the underwriters overallotment option	4,427,500
Price per share of common stock shares issued (in dollars per share)	$ 33.00
Net proceeds	$ 138,300	$ 138,301	$ 7,143