SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $)	12 Months Ended
	Jul. 28, 2012 W M	Jul. 30, 2011 W	Jul. 31, 2010 W
Basis of Presentation
Weeks in a fiscal year (in weeks)	52	52	52
Weeks in interim quarter (in weeks)	13	13	13
Cash Equivalents
Maximum original maturity of securities to be classified as cash equivalents (in months)	3
Property and equipment
Interest capitalized			$ 100,000
Property and equipment
Property and equipment, gross	500,515,000	457,518,000
Less accumulated depreciation and amortization	222,060,000	172,367,000
Net property and equipment	278,455,000	285,151,000
Depreciation expense	35,200,000	31,100,000	25,000,000
Land
Property and equipment
Property and equipment, gross	13,311,000	13,241,000
Buildings and improvements
Property and equipment
Original Estimated Useful Lives (Years), minimum	20	20
Original Estimated Useful Lives (Years), maximum	40	40
Property and equipment, gross	160,940,000	158,790,000
Leasehold improvements
Property and equipment
Original Estimated Useful Lives (Years), minimum	5	5
Original Estimated Useful Lives (Years), maximum	20	20
Property and equipment, gross	85,648,000	77,605,000
Warehouse equipment
Property and equipment
Original Estimated Useful Lives (Years), minimum	3	3
Original Estimated Useful Lives (Years), maximum	30	30
Property and equipment, gross	104,310,000	88,643,000
Office equipment
Property and equipment
Original Estimated Useful Lives (Years), minimum	3	3
Original Estimated Useful Lives (Years), maximum	10	10
Property and equipment, gross	68,674,000	58,643,000
Computer software
Property and equipment
Original Estimated Useful Lives (Years), minimum	3	3
Original Estimated Useful Lives (Years), maximum	7	7
Property and equipment, gross	50,998,000	40,986,000
Motor vehicles
Property and equipment
Original Estimated Useful Lives (Years), minimum	3	3
Original Estimated Useful Lives (Years), maximum	7	7
Property and equipment, gross	4,562,000	4,182,000
Construction in progress
Property and equipment
Property and equipment, gross	$ 12,072,000	$ 15,428,000