CREDIT FACILITY (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	6 Months Ended		12 Months Ended	6 Months Ended					6 Months Ended					6 Months Ended			1 Months Ended		1 Months Ended			1 Months Ended
	Aug. 31, 2011	Jul. 30, 2011 2008 Credit Agreement Credit Agreement	Jul. 31, 2010 2008 Credit Agreement Credit Agreement	Jan. 29, 2011 2008 Credit Agreement Credit Agreement	Jul. 30, 2011 2008 Credit Agreement Credit Agreement Prime rate	Jul. 30, 2011 2008 Credit Agreement Credit Agreement LIBOR	Jul. 30, 2011 2008 Credit Agreement Revolving Credit Facility	Jan. 29, 2011 2008 Credit Agreement Revolving Credit Facility	Jul. 31, 2010 2008 Credit Agreement Revolving Credit Facility	Jul. 30, 2011 2008 Credit Agreement Standby and Documentary Letters of Credit	Jul. 31, 2010 2008 Credit Agreement Standby and Documentary Letters of Credit	Jul. 30, 2011 2008 Credit Agreement Merchandise Letters of Credit	Jan. 29, 2011 2008 Credit Agreement Merchandise Letters of Credit	Jul. 31, 2010 2008 Credit Agreement Merchandise Letters of Credit	Jul. 30, 2011 2008 Credit Agreement Standby Letters of Credit	Jan. 29, 2011 2008 Credit Agreement Standby Letters of Credit	Jul. 31, 2010 2008 Credit Agreement Standby Letters of Credit	Aug. 31, 2011 2011 Amendment Credit Agreement	Aug. 16, 2011 2011 Amendment Credit Agreement	Aug. 31, 2011 2011 Amendment Credit Agreement Prime rate	Aug. 31, 2011 2011 Amendment Credit Agreement LIBOR	Aug. 16, 2011 2011 Amendment Standby and Documentary Letters of Credit	Aug. 31, 2011 2011 Amendment Merchandise Letters of Credit	Aug. 31, 2011 2011 Amendment Standby Letters of Credit	Jul. 31, 2008 Credit Agreement
Credit facilities
Term of credit agreement (in years)																									5
Line of credit facility, maximum borrowing capacity							$ 200.0	$ 200.0	$ 200.0										$ 150.0
Maximum sublimit amount under Credit Agreement for standby and documentary letters of credit										175												125
Basis spread on variable rate, low end of range (as a percent)					0.00%	2.00%														0.75%	1.75%
Basis spread on variable rate, high end of range (as a percent)					0.50%	2.50%														1.00%	2.00%
Line of credit facility, unused line fee percentage, low end of range (as a percent)		0.50%
Line of credit facility, unused line fee percentage, high end of range (as a percent)		0.75%
Line of credit facility, unused line fee percentage (as a percent)																		0.375%
Letters of credit facility fee, low end of range (as a percent)												1.25%			2.00%								0.875%	1.25%
Letters of credit facility fee, high end of range (as a percent)												1.75%			2.50%								1.00%	1.50%
Termination fee (as a percent)			0.25%
Extension to the term of credit agreement (in years)																		3
Borrowing capacity, accordion feature																			75.0
Borrowing base, amount committed		168.9	169.8	168.4															25.0
Deferred financing costs paid	0.7																	0.7
Deferred financing costs gross			2.6
Deferred financing costs, remaining unamortized balance		1.2
Letter of credit fees										0.2	0.2
Variable interest rate basis						LIBOR (based on a 1 week or 1, 2, 3, or 6 month interest period)															LIBOR
Components of credit facilities
Letters of credit outstanding												24.2	41.3	37.1	11.1	11.0	10.9
Utilization of credit facility at end of period		35.3	48.0	52.3
Availability		133.6	121.8	116.1
Interest rate at end of period (as a percent)		3.30%	3.30%	3.30%
Highest end of day loan balance during the period		$ 0.2		$ 0.1
Average interest rate (as a percent)		3.30%	3.30%	3.30%