Annual report pursuant to Section 13 and 15(d)

Employee Defined Contribution Plan (Details)

v3.20.4
Employee Defined Contribution Plan (Details) - 401(k) Plan [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 27, 2020
Dec. 29, 2019
Dec. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Minimum age of employees to be eligible to participate in defined contribution plan 21 years    
Defined Contribution Plan, Employer Matching Contribution, Percent of Match     50.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay     4.00%
Matching contribution expense $ 2.5 $ 3.0 $ 0.9
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Defined Contribution Plan, Employer Matching Contribution, Percent of Match   100.00%  
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay   3.00%  
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Defined Contribution Plan, Employer Matching Contribution, Percent of Match   50.00%  
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay   2.00%