STOCK-BASED COMPENSATION (Details) (USD $)	3 Months Ended				12 Months Ended
	Jan. 28, 2012 y	Oct. 29, 2011 y	Jul. 30, 2011 y	Apr. 30, 2011 y	Jan. 28, 2012 y	Jan. 29, 2011 y	Jan. 30, 2010
Stock-based compensation expense by type:
Total stock-based compensation expense					$ 5,453,000	$ 4,796,000	$ 4,157,000
Income tax benefit recognized					1,987,000	1,666,000	1,277,000
Stock-based compensation expense, net of income tax					3,466,000	3,130,000	2,880,000
Actual income tax benefit realized for the deductions considered on our income tax returns					4,500,000	500,000
Fair value and valuation assumptions [Abstract]
Exercise price (in dollars per share)	$ 45.18	$ 33.90	$ 40.71	$ 35.81	$ 45.18
Weighted average fair value at grant date (in dollars per share)	$ 17.92	$ 13.86	$ 15.95	$ 14.52
Expected life (in years)	4.75	4.75	4.67	4.67
Expected volatility (in hundredths)	46.18%	47.60%	44.31%
Expected volatility - minimum (in hundredths)				45.26%
Expected volatility - maximum (in hundredths)				45.52%
Risk-free interest rate (in hundredths)	0.78%	0.90%	1.61%
Risk-free interest rate - minimum (in hundredths)				1.72%
Risk-free interest rate - maximum (in hundredths)				2.07%
Dividend yield (in hundredths)	0.00%	0.00%	0.00%	0.00%
Stock option activity [Roll Forward]
Exercised (in shares)					245,402
Forfeited, cancelled or expired (in shares)					0
Options outstanding at end of period (in shares)	421,196				421,196	631,041
Exercisable at end of period (in shares)	392,821				392,821
Weighted Average Exercise Price, Options exercised (in dollars per share)	$ 19.97				$ 19.97
Weighted Average Exercise Price, Options forfeited, cancelled or expired (in dollars per share)					$ 0.00
Weighted Average Exercise Price, Options outstanding at end of period (in dollars per share)						$ 21.54
Weighted Average Exercise Price, Options Exercisable at end of period (in dollars per share)	$ 23.70				$ 23.70
Weighted Average Remaining Contractual Term, Options outstanding at end of period (in years)	5.16				5.16	4.90
Weighted Average Remaining Contractual Term, Options exercisable at end of period (in years)					5.16
Aggregate Intrinsic Value, Options outstanding at end of period	9,837,000				9,837,000	6,933,000
Aggregate Intrinsic Value, Options exercisable at end of period	9,311,000				9,311,000
Intrinsic value of stock options exercised					5,300,000	11,300,000	1,300,000
Cash received from stock option exercises					4,900,000	9,100,000	800,000
Restricted Stock and Performance-Based Units
Intrinsic value of vested RSUs					3,300,000
Intrinsic value of nonvested RSUs	36,900,000				36,900,000	22,100,000	11,300,000
Director Deferred Compensation [Abstract]
Total number of stock units deferred under plan (in shares)					1,561	0	0
Employee Stock Purchases [Abstract]
Shares purchased					9,184	13,144	19,152
Average price per share					$ 29.76	$ 19.92	$ 14.34
Equity Incentive Plan [Member]
Stock-based compensation plans [Abstract]
Authorized but unissued shares of common stock (in shares)	1,983,159				1,983,159
Shares available for grant under the Plan (in shares)	911,626				911,626
Employee Stock Purchase Plan [Member]
Stock-based compensation plans [Abstract]
Authorized but unissued shares of common stock (in shares)	204,794				204,794
Shares available for grant under the Plan (in shares)	92,915				92,915
Percentage of quarterly closing price employees pay for shares (in hundredths)					85.00%
Stock-based compensation expense by type:
Total stock-based compensation expense					76,000	67,000	80,000
Fair value and valuation assumptions [Abstract]
Weighted average fair value at grant date (in dollars per share)					$ 8.23	$ 5.19	$ 4.27
Expected life (in years)					0.25	0.25	0.25
Expected volatility - minimum (in hundredths)					43.60%	43.50%	47.50%
Expected volatility - maximum (in hundredths)					45.20%	46.60%	68.00%
Risk-free interest rate - minimum (in hundredths)					0.04%	0.05%	0.03%
Risk-free interest rate - maximum (in hundredths)					0.10%	0.15%	0.22%
Dividend yield (in hundredths)					0.00%	0.00%	0.00%
Director Deferred Compensation Plan [Member]
Stock-based compensation plans [Abstract]
Authorized but unissued shares of common stock (in shares)	112,500				112,500
Shares available for grant under the Plan (in shares)	61,147				61,147
Stock-based compensation expense by type:
Total stock-based compensation expense					60,000	0	0
Actual income tax benefit realized for the deductions considered on our income tax returns					22,000	0	0
Non-Employee Director Equity Plan [Member]
Stock-based compensation plans [Abstract]
Authorized but unissued shares of common stock (in shares)	679,891				679,891
Shares available for grant under the Plan (in shares)	510,165				510,165
Stock Options [Member]
Stock-based compensation expense by type:
Total stock-based compensation expense					460,000	792,000	1,799,000
Income tax benefit recognized					200,000	200,000	400,000
Fair value and valuation assumptions [Abstract]
Weighted average fair value at grant date (in dollars per share)					$ 12.95	$ 11.00	$ 9.48
Stock option activity [Roll Forward]
Weighted Average Exercise Price, Options granted (in dollars per share)	$ 32.21				$ 32.21
Weighted Average Exercise Price, Options outstanding at end of period (in dollars per share)	$ 23.35				$ 23.35
Restricted stock unit activity [Roll Forward]
Granted (in shares)					35,557
RSUs [Member]
Stock-based compensation expense by type:
Total stock-based compensation expense					4,857,000	3,937,000	2,278,000
Income tax benefit recognized					1,800,000	1,400,000	900,000
Fair value and valuation assumptions [Abstract]
Weighted average fair value at grant date (in dollars per share)					$ 31.31	$ 25.86	$ 18.06
Nonvested awards [Abstract]
Unrecognized compensation cost related to nonvested awards	8,400,000				8,400,000
Unrecognized compensation cost related to nonvested awards, recognition period (in years)					2.4
Restricted stock unit activity [Roll Forward]
Granted (in shares)					103,143	193,421	238,607
PSU Multiplier Earned (in shares)					0
Vested					92,041
Forfeited, cancelled or expired					14,940
Restricted stock unit awards outstanding at January 29, 2011	457,322				457,322	461,160
Weighted Average Grant Date Fair Value - Granted					$ 31.34
Weighted Average Grant Date Fair Value - PSU Multiplier Earned					$ 0.00
Weighted Average Grant Date Fair Value - Vested					$ 28.93
Weighted Average Grant Date Fair Value - Forfeited, cancelled or expired	$ 22.57				$ 22.57
Weighted Average Grant Date Fair Value at January 28, 2012	$ 22.09				$ 22.09	$ 21.41
PSUs [Member]
Restricted stock unit activity [Roll Forward]
Granted (in shares)					53,000
PSU Multiplier Earned (in shares)					40,335
Vested					15,755
Forfeited, cancelled or expired					0
Restricted stock unit awards outstanding at January 29, 2011	295,850				295,850	218,270
Weighted Average Grant Date Fair Value - Granted					$ 31.26
Weighted Average Grant Date Fair Value - PSU Multiplier Earned					$ 24.89
Weighted Average Grant Date Fair Value - Vested					$ 14.93
Weighted Average Grant Date Fair Value - Forfeited, cancelled or expired	$ 0.00				$ 0.00
Weighted Average Grant Date Fair Value at January 28, 2012	$ 22.95				$ 22.95	$ 19.98
Store operating, selling and administrative expenses [Member] | Employee Stock Purchase Plan [Member]
Stock-based compensation expense by type:
Total stock-based compensation expense					100,000	100,000	100,000
Store operating, selling and administrative expenses [Member] | Stock Options [Member]
Stock-based compensation expense by type:
Total stock-based compensation expense					400,000	800,000	1,800,000
Store operating, selling and administrative expenses [Member] | RSUs [Member]
Stock-based compensation expense by type:
Total stock-based compensation expense					4,900,000	3,900,000	2,300,000
Store operating, selling and administrative expenses [Member] | Deferred Stock Units [Member]
Stock-based compensation expense by type:
Total stock-based compensation expense					$ 60,000	$ 0	$ 0