SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Narrative (Details)	12 Months Ended
	Jan. 28, 2017 USD ($) store state	Jan. 30, 2016 USD ($) store	Jan. 31, 2015 USD ($) store	Feb. 01, 2014 USD ($)
Nature of Operations
Number of stores (store) | store	467
Number of states in which stores are located (state) | state	44
New stores opened during the period (store) | store	5	9	16
Stores substantially remodeled during the period (store) | store	19	14	18
Stores closed during the period (store) | store	6	1	6
Revenue Recognition
Shipping costs during the period	$ 6,880,000	$ 7,420,000	$ 6,549,000
Number of years of outstanding balances used in calculating gift certificate liability (years)	3 years
Number of years of outstanding balances used in calculating gift card liability (years)	4 years
Gift card breakage income	$ 2,067,000	1,934,000	860,000
Liability for estimated future loyalty rewards	8,910,000
Inventory
Adjustment for merchandise obsolescence and markdowns	11,376,000	9,326,000
Cost of sales, effect of changes in markdown adjustment	2,050,000	1,356,000	555,000
Advertising Costs
Advertising expense	16,188,000	13,262,000	12,041,000
Health Care Costs
Self-insurance limit per employee per plan year for health and dental claims	200,000
Reserve for self-insured employee health care claims	$ 1,295,000	765,000
Income Taxes
Minimum percentage needed for likely sustainment of an uncertain tax position before related tax benefits are recognized (percent)	50.00%
Financial Instruments and Credit Risk Concentrations
Cash and investments	$ 264,622,000
Available-for-sale securities	1,670,000
Supplemental Cash Flow Information
Non-cash investing activities - change in unpaid purchases of property, plant and equipment	469,000	1,670,000	(1,482,000)
Current liability for unpaid purchases of property, plant and equipment	647,000	1,116,000	2,786,000
Cash paid for income taxes	$ 65,180,000	93,425,000	100,551,000
Minimum [Member]
Financial Instruments and Credit Risk Concentrations
Dutch auction, reset interval (days)	7 days
Maximum [Member]
Financial Instruments and Credit Risk Concentrations
Dutch auction, reset interval (days)	49 days
Property And Equipment Excluding Buildings [Member] | Minimum [Member]
Property and Equipment
Estimated useful life of property and equipment (years)	5 years
Property And Equipment Excluding Buildings [Member] | Maximum [Member]
Property and Equipment
Estimated useful life of property and equipment (years)	10 years
Building [Member] | Minimum [Member]
Property and Equipment
Estimated useful life of property and equipment (years)	31 years 6 months
Building [Member] | Maximum [Member]
Property and Equipment
Estimated useful life of property and equipment (years)	39 years
Allowance for Sales Returns [Member]
Revenue Recognition
Reserve for merchandise returns	$ 669,000	$ 834,000	$ 943,000	$ 750,000