BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended			138 Months Ended
	Jan. 30, 2016 USD ($) Segment shares	Jan. 31, 2015 USD ($) shares	Feb. 01, 2014 USD ($)	Jan. 30, 2016 USD ($) shares
Business [Abstract]
Operating Cycle, Period Disclosure	364 days	364 days	364 days
Segment Reporting [Abstract]
Number of reportable segments | Segment	1
Customers [Abstract]
Concentration risk	No customer accounted for more than 5.0% of our net sales
Advertising expense [Abstract]
Gross advertising costs	$ 9,983,000	$ 9,763,000	$ 8,980,000
Advertising reimbursements	(2,949,000)	(3,456,000)	(3,335,000)
Net advertising costs	7,034,000	6,307,000	5,645,000
Stock repurchase program [Abstract]
Amount authorized for Stock Repurchase Program	300,000,000			$ 300,000,000
Repurchased common stock (in shares) | shares				15,800,000
Cost of repurchased common stock	89,212,000	56,302,000	15,807,000	$ 495,700,000
Remaining amount available under Stock Repurchase Program	300,000,000			300,000,000
Cash and cash equivalents [Abstract]
Cash equivalents related to credit and debit card transactions	$ 4,300,000	5,200,000		4,300,000
Days to collect debit and credit card transactions (in days)	3 days
Investments [Abstract]
Investments included in other assets	$ 2,500,000	2,600,000		2,500,000
Net unrealized holding gains	(100,000)	31,000
Other Prepaid Expense, Current	100,000	100,000		100,000
Total Investments	2,600,000	2,700,000		2,600,000
Trade and other accounts receivable [Abstract]
Allowance for doubtful accounts	89,000	79,000		89,000
Inventory and valuation [Abstract]
Accrual for inventory obsolescence	3,700,000	3,500,000		3,700,000
Accrual for inventory shrinkage	1,300,000	1,200,000		1,300,000
Vendor-owned inventories held at our locations	$ 5,700,000	3,800,000		$ 5,700,000
Property and equipment [Abstract]
Construction in progress, technology projects (in hundredths)	94.00%			94.00%
Deferred rent [Abstract]
Liability for the current portion of unamortized landlord allowances	$ 3,700,000	3,300,000		$ 3,700,000
Liability for long-term portion of unamortized landlord allowances	14,400,000	12,400,000		14,400,000
Estimate of the non-cash portion of landlord allowances	$ 1,100,000	1,300,000
Revenue recognition [Abstract]
Days allowed for entire purchase price for merchandise placed on layaway	within 30 days
Gift card breakage revenue	$ (24,000)	700,000	200,000
Net deferred revenue liability	5,500,000	4,700,000		5,500,000
Sales returns [Abstract]
Net sales returns	34,800,000	32,300,000	$ 30,500,000
Accrual for the effect of estimated returns on pre-tax income	$ 400,000	500,000		400,000
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)	7 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
Health Claims [Member]
Insurance accrual [Abstract]
Accrual for insurance liability	$ 700,000	800,000		700,000
Workers Compensation and General Liability Stop-loss [Member]
Insurance accrual [Abstract]
Accrual for insurance liability	400,000	$ 400,000		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
Under November 2012 Authorization [Member]
Stock repurchase program [Abstract]
Repurchased common stock (in shares) | shares	2,200,000	1,200,000
Cost of repurchased common stock	$ 91,300,000	$ 61,000,000
Number of restricted stock unit awards repurchased to satisfy tax withholding requirements (in shares) | shares	43,000.0	82,000.0
Tax withholding requirements	$ 2,100,000	$ 4,700,000
Supplier Concentration Risk [Member] | Nike [Member]
Inventory and valuation [Abstract]
Percentage of purchases from supplier (in hundredths)	57.50%	55.70%	52.30%
Supplier Concentration Risk [Member] | Second Largest Vendor [Member]
Inventory and valuation [Abstract]
Percentage of purchases from supplier (in hundredths)	15.90%	15.40%	15.60%
Supplier Concentration Risk [Member] | Third Largest Vendor [Member]
Inventory and valuation [Abstract]
Percentage of purchases from supplier (in hundredths)	4.20%	6.40%	8.60%