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Stock-Based Compensation (Narrative) (Details) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term 5 years 6 years 6 years
Non-vested Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost $ 3.8    
Nonvested stock, weighted average recognition period 1 year 1 month 2 days    
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (years) 3 years    
Unrecognized compensation cost $ 0.8    
Nonvested stock, weighted average recognition period 1 year 17 days    
Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future issuance (shares) 2.6    
Exercised period (years) 10 years    
Plan | Cliff vesting      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (years) 4 years