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Stock-Based Employee Compensation-Equity Instruments Other than Options (Narrative) (Details)
shares in Thousands, $ in Millions
1 Months Ended 3 Months Ended
Jun. 15, 2015
Jun. 15, 2014
Jun. 30, 2015
shares
Jun. 29, 2014
Installment
shares
Jun. 28, 2015
USD ($)
shares
Mar. 29, 2015
shares
Restricted Stock Units (RSUs)            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period         3 years  
Units Outstanding         3,764 3,457
Equity instruments other than options, vested and expected to vest, outstanding (shares)         3,000  
Equity instruments other than options, vested and expected to vest, weighted average remaining contractual term         1 year 8 months 26 days  
Equity instruments other than options, vested and expected to vest, aggregate intrinsic value | $         $ 65.5  
Compensation cost not yet recognized | $         $ 31.9  
Compensation cost not yet recognized, period for recognition         1 year 10 months 17 days  
Granted (shares)         1,381  
Performance Shares            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Units Outstanding         294 517
Equity instruments other than options, vested and expected to vest, outstanding (shares)         200  
Equity instruments other than options, vested and expected to vest, weighted average remaining contractual term         10 months 15 days  
Equity instruments other than options, vested and expected to vest, aggregate intrinsic value | $         $ 4.9  
Compensation cost not yet recognized | $         $ 0.3  
Compensation cost not yet recognized, period for recognition         10 months 16 days  
Granted (shares)         3  
Market-Based Stock Units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period     2 years 2 years    
Units Outstanding         800  
Equity instruments other than options, vested and expected to vest, outstanding (shares)         600  
Equity instruments other than options, vested and expected to vest, weighted average remaining contractual term         1 year 8 months 13 days  
Equity instruments other than options, vested and expected to vest, aggregate intrinsic value | $         $ 13.6  
Compensation cost not yet recognized | $         $ 10.9  
Compensation cost not yet recognized, period for recognition         1 year 9 months 4 days  
Granted (shares)     200 500    
Number of installments | Installment       2    
Expected term (in years) 1 year 9 months 18 days 1 year 9 months 18 days        
Minimum | Performance Shares            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period         1 year  
Maximum | Performance Shares            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Award vesting period         3 years