INCOME TAXES (Details) - USD ($)	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Federal:
Current	$ 31,007,000	$ 36,053,000	$ 35,013,000
Deferred	1,359,000	1,188,000	4,059,000
Total federal	32,366,000	37,241,000	39,072,000
State:
Current	3,042,000	3,743,000	4,756,000
Deferred	13,000	200,000	441,000
Total state	3,055,000	3,943,000	5,197,000
Total tax provison	$ 35,421,000	$ 41,184,000	$ 44,269,000
Reconciliation of federal statutory tax rate to effective tax rate
Tax provision computed at the federal statutory rate (in hundredths)	35.00%	35.00%	35.00%
Effect of state income taxes, net of federal benefits (in hundredths)	2.22%	2.40%	2.85%
Other, net (in hundredths)	(0.51%)	(0.53%)	(0.29%)
Tax provision at effective rate (in hundredths)	36.71%	36.87%	37.56%
Deferred tax assets and liabilities, net
Deferred rent	$ 10,298,000	$ 8,769,000
Inventories	4,953,000	4,920,000
Accruals	5,709,000	4,900,000
Stock-based compensation	4,974,000	4,755,000
Other	150,000	59,000
Total deferred tax assets	26,084,000	23,403,000
Accumulated depreciation and amortization	(19,735,000)	(15,723,000)
Prepaid expenses	(836,000)	(681,000)
Accruals	0	(44,000)
State taxes	(228,000)	(298,000)
Total deferred tax liabilities	(20,799,000)	(16,746,000)
Deferred income taxes, net	5,285,000	6,657,000
Reconciliation of unrecognized tax benefit [Roll Forward]
Unrecognized tax benefit - beginning of year	1,242,000	1,339,000	$ 1,539,000
Gross increases - tax positions in prior period	158,000	90,000	122,000
Gross decreases - tax positions in prior period	(26,000)	(39,000)	(168,000)
Gross increases - tax positions in current period	121,000	122,000	162,000
Settlements	0	0	(119,000)
Lapse of statute of limitations	(228,000)	(270,000)	(197,000)
Unrecognized tax benefit - end of year	1,267,000	1,242,000	1,339,000
Accrued interest and penalties related to unrecognized tax benefits	100,000	100,000	100,000
Interest and penalties recorded	21,000	(5,000)	(100,000.0)
Unrecognized tax benefits that would affect effective income tax rate	$ 900,000	$ 900,000	$ 1,000,000