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Employee Benefit Plans - (Benefits Expected to be Paid in Future Years) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 30, 2020
Dec. 25, 2019
Retirement Benefits [Abstract]    
Employer contributions $ 528 $ 162
Estimated employer contributions during 2020 700  
Benefits expected to be paid:    
2021 716  
2022 406  
2023 550  
2024 122  
2025 100  
2026 through 2030 $ 413