BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) Share data in Millions, unless otherwise specified	12 Months Ended			126 Months Ended
	Jan. 31, 2015 Segment	Feb. 01, 2014	Feb. 02, 2013	Jan. 31, 2015
Business [Abstract]
Operating Cycle, Period Disclosure	364 days	364 days	371 days
Segment Reporting [Abstract]
Number of reportable segments	1
Customers [Abstract]
Concentration risk	No customer accounted for more than 5.0% of our net sales
Advertising expense [Abstract]
Gross advertising costs	$ 9,763,000	$ 8,980,000	$ 9,554,000
Advertising reimbursements	(3,456,000)	(3,335,000)	(4,002,000)
Net advertising costs	6,307,000	5,645,000	5,552,000
Stock repurchase program [Abstract]
Repurchased common stock (in shares)				13.6
Cost of repurchased common stock	60,971,000	20,095,000	49,852,000	404,300,000
Remaining amount available under Stock Repurchase Program	173,300,000			173,300,000
Cash and cash equivalents [Abstract]
Cash equivalents related to credit and debit card transactions	5,200,000	3,500,000		5,200,000
Days to collect debit and credit card transactions (in days)	3 days
Investments [Abstract]
Investments included in other assets	2,600,000	2,100,000		2,600,000
Net unrealized holding gains	31,000	200,000
Other Prepaid Expense, Current	100,000	500,000		100,000
Total Investments	2,700,000	2,600,000		2,700,000
Trade and other accounts receivable [Abstract]
Allowance for doubtful accounts	79,000	42,000		79,000
Inventory and valuation [Abstract]
Accrual for inventory obsolescence	3,500,000	2,200,000		3,500,000
Accrual for inventory shrinkage	1,200,000	1,300,000		1,200,000
Vendor-owned inventories held at our locations	3,800,000	1,100,000		3,800,000
Property and equipment [Abstract]
Construction in progress, technology projects (in hundredths)	84.00%			84.00%
Deferred rent [Abstract]
Liability for the current portion of unamortized landlord allowances	3,300,000	3,100,000		3,300,000
Liability for long-term portion of unamortized landlord allowances	12,400,000	10,500,000		12,400,000
Estimate of the non-cash portion of landlord allowances	1,300,000	2,100,000
Revenue recognition [Abstract]
Days allowed for entire purchase price for merchandise placed on layaway	within 30 days
Gift card breakage revenue	700,000	200,000	300,000
Net deferred revenue liability	4,700,000	4,500,000		4,700,000
Sales returns [Abstract]
Net sales returns	32,300,000	30,500,000	28,800,000
Accrual for the effect of estimated returns on pre-tax income	500,000	400,000		500,000
Health Claims [Member]
Insurance accrual [Abstract]
Accrual for insurance liability	800,000	800,000		800,000
Workers Compensation and General Liability Stop-loss [Member]
Insurance accrual [Abstract]
Accrual for insurance liability	400,000	300,000		400,000
Health Claims Stop-Loss, Per Year [Member]
Insurance accrual [Abstract]
Stop-loss insurance, maximum per covered person	200,000			200,000
Health Care Claims Stop-loss, Lifetime [Member]
Insurance accrual [Abstract]
Stop-loss insurance, maximum per covered person
Equipment [Member] | Minimum [Member]
Property and equipment [Abstract]
Estimated service lives (in years)	3 years
Equipment [Member] | Maximum [Member]
Property and equipment [Abstract]
Estimated service lives (in years)	5 years
Furniture and Fixtures [Member]
Property and equipment [Abstract]
Estimated service lives (in years)	7 years
Buildings [Member]
Property and equipment [Abstract]
Estimated service lives (in years)	39 years
Leasehold Improvements [Member] | Minimum [Member]
Property and equipment [Abstract]
Estimated service lives (in years)	3 years
Leasehold Improvements [Member] | Maximum [Member]
Property and equipment [Abstract]
Estimated service lives (in years)	10 years
Supplier Concentration Risk [Member] | Nike [Member]
Inventory and valuation [Abstract]
Percentage of purchases from supplier (in hundredths)	55.70%	52.30%	48.90%
Supplier Concentration Risk [Member] | Second Largest Vendor [Member]
Inventory and valuation [Abstract]
Percentage of purchases from supplier (in hundredths)	15.40%	15.60%	12.80%
Supplier Concentration Risk [Member] | Third Largest Vendor [Member]
Inventory and valuation [Abstract]
Percentage of purchases from supplier (in hundredths)	6.40%	8.60%	10.90%
Under November 2012 Authorization [Member]
Stock repurchase program [Abstract]
Amount authorized for Stock Repurchase Program	250,000,000			250,000,000
Repurchased common stock (in shares)	1.2	0.4
Cost of repurchased common stock	61,000,000	20,100,000
Number of restricted stock unit awards repurchased to satisfy tax withholding requirements (in shares)	0.1	0.1
Tax withholding requirements	$ 4,700,000	$ 4,300,000