Annual report pursuant to Section 13 and 15(d)

Common Stock and Stock-Based Incentive Compensation Plans - Weighted Average Valuation Assumptions for ESPP (Details)

v3.20.4
Common Stock and Stock-Based Incentive Compensation Plans - Weighted Average Valuation Assumptions for ESPP (Details) - ESPP
12 Months Ended
Dec. 26, 2020
Dec. 28, 2019
Dec. 29, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected dividends 0.00% 0.00% 0.00%
Expected term (in years) 6 months 6 months 6 months
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility 55.16% 48.95% 45.88%
Risk-free interest rate 0.11% 1.58% 2.05%
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected volatility 66.53% 67.02% 66.66%
Risk-free interest rate 0.15% 0.0246% 2.52%