Annual report pursuant to Section 13 and 15(d)

Credit Facilities - Additional Information (Details)

Credit Facilities - Additional Information (Details) - USD ($)
12 Months Ended
Mar. 26, 2021
Sep. 29, 2020
Apr. 17, 2020
Dec. 31, 2020
Line of Credit Facility [Line Items]        
Revolving credit facility       $ 40,000,000.0
Maturity date       Jun. 30, 2022
Surety bonds       $ 291,200,000
Scenario Forecast        
Line of Credit Facility [Line Items]        
Extended maturity date Jun. 30, 2023      
Scenario Forecast | Maximum        
Line of Credit Facility [Line Items]        
Letter of credit facility $ 20,000,000.0      
LC Facility        
Line of Credit Facility [Line Items]        
Total outstanding letters of credit       $ 10,700,000
Fees on undrawn borrowings (percentage)       0.40%
Letter of Credit        
Line of Credit Facility [Line Items]        
Stated interest rate (percentage)       2.00%
PPP Loan        
Line of Credit Facility [Line Items]        
Maturity date     Apr. 17, 2022  
Stated interest rate (percentage)     1.00%  
Unsecured loan amount     $ 10,000,000.0  
Prepayment penalties     $ 0  
Loan agreement condition terms         • Only amounts expended for Permissible Expenses during the eight-week or 24-week period, as elected by us, following April 17, 2020 (the “Covered Period”) are eligible for loan forgiveness. We have elected an eight-week Covered Period;   • Of the total amount of Permissible Expenses for which forgiveness can be granted, at least 60% must be for payroll costs, or a proportionate reduction of the maximum loan forgiveness amount will occur; and
Minimum percentage of payroll costs for loan forgiveness     60.00%  
Employee compensation reduction minimum percentage     25.00%  
Payment term description       The PPP Loan matures on April 17, 2022, bears interest at a fixed rate of 1.0 percent per annum and is payable in monthly installments commencing on the earlier of the date on which the amount of loan forgiveness is determined or March 17, 2021.
PPP loan proceeds used for permissible expenses, percentage related to payroll costs     93.00%  
Loan forgiveness   $ 8,900,000    
Loan payments   $ 0    
PPP Loan threshold requiring an audit by the SBA       $ 2,000,000.0