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Share-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Aug. 29, 2014
Aug. 29, 2014
Performance Units [Member]
Aug. 23, 2013
Performance Units [Member]
Aug. 29, 2014
Performance Units [Member]
Aug. 23, 2013
Performance Units [Member]
Aug. 29, 2014
Restricted Stock Units [Member]
Aug. 23, 2013
Restricted Stock Units [Member]
Aug. 29, 2014
Restricted Stock Units [Member]
Aug. 23, 2013
Restricted Stock Units [Member]
Aug. 23, 2013
2014 Performance Unit Award [Member]
Performance Units [Member]
Market Condition [Member]
Aug. 24, 2012
2013 Performance Unit Award [Member]
Performance Units [Member]
Market Condition [Member]
Aug. 29, 2014
2015 Performance Unit Award [Member]
Performance Units [Member]
Market Condition [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Document Period End Date Aug. 29, 2014                      
Allocated Share-based Compensation Expense   $ 0.9 $ 0.2 $ 3.5 $ 5.4 $ 2.0 $ 1.2 $ 8.7 $ 6.8      
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense   $ 0.3 $ 0.1 $ 1.3 $ 2.1 $ 0.7 $ 0.2 $ 3.1 $ 2.2      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]                        
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate                   0.30% [1] 0.50% [1] 0.70% [1]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term                   3 years 3 years 3 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate                   44.70% [2] 49.80% [2] 42.20% [2]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number       1,833,288       2,001,758        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       611,024       709,518        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period               223,989        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period               26,463        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number   2,444,312   2,444,312   2,460,824   2,460,824        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value       $ 14.04       $ 11.71        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 19.97       $ 16.63   $ 15.50 $ 11.92 $ 23.25
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value               $ 14.43        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value               $ 12.92        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value   $ 14.65   $ 14.65   $ 13.20   $ 13.20        
[1] Based on the U.S. government bond benchmark on the grant date.
[2] Represents the historical price volatility of the Company’s common stock for the three-year period preceding the grant date.