SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 3) (USD $)	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2008
Stock Repurchase Program
Authorized amount of stock repurchase				$ 350,000,000
Remaining authorized amount of stock repurchase	23,300,000
Preferred Stock
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, par value per share (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Advertising Expenses
Advertising expenses	83,600,000	94,500,000	76,500,000
Prepaid advertising	4,887,000	704,000
Vendor Allowances
Vendor allowance included in advertising expenses	1,900,000	3,100,000	1,000,000
Vendor allowance included in cost of sales	$ 10,100,000	$ 5,200,000	$ 3,700,000
Leasehold improvements | Minimum
Depreciation and amortization
Estimated useful lives	5 years
Leasehold improvements | Maximum
Depreciation and amortization
Estimated useful lives	10 years
Fixtures and equipment | Minimum
Depreciation and amortization
Estimated useful lives	3 years
Fixtures and equipment | Maximum
Depreciation and amortization
Estimated useful lives	15 years
Vehicles
Depreciation and amortization
Estimated useful lives	4 years