Annual report pursuant to Section 13 and 15(d)

Common Stock and Stock-Based Incentive Compensation Plans (Details) (Stock Option Valuation Assumptions)

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Common Stock and Stock-Based Incentive Compensation Plans (Details) (Stock Option Valuation Assumptions) - Stock Options
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility     57.26%
Risk-free interest rate     1.68%
Expected dividends 0.00% 0.00% 0.00%
Expected life (in years)     3 years 11 months 1 day
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility 52.60% 51.51%  
Risk-free interest rate 1.53% 2.20%  
Expected life (in years) 3 years 11 months 8 days 3 years 11 months 1 day  
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility 56.51% 60.46%  
Risk-free interest rate 2.51% 2.83%  
Expected life (in years) 3 years 11 months 12 days 3 years 11 months 8 days