SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fiscal Year [Abstract]
Number of weeks in fiscal quarter (in weeks)	13
Number of weeks in fourth quarter (in weeks)	14
Number of weeks in fiscal period (in weeks)	53
Advertising Costs [Abstract]
Amortization period, minimum	1 month
Amortization period, maximum	4 months
Advertising expense	$ 57.7	$ 40.2	$ 31.7
Vendor consideration	47.8	59.4	65.6
Deferred advertising costs	1.5	1.7
Net Income Per Common Share [Abstract]
Weighted average number of stock options outstanding, treasury stock (in shares)	0	0.3	0.6
Weighted average number of stock options outstanding, restricted stock (in shares)	0.0	0.1	0.2
Employee Benefit Plans [Abstract]
Minimum annual contribution per employee (in hundredths)	1.00%
Aggregate expense in contributions plans	$ 1.0	$ 1.0	$ 0.9
Supplier Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk (in hundredths)	0.00%	11.50%	10.00%
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	1.1	0.8	0.7
Furniture, Fixtures and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	3
Furniture, Fixtures and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	10
Building [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	30
Building [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Estimated useful lives	50