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Employee Benefit Plans - (Defined Contribution Plans) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 30, 2020
Dec. 25, 2019
Dec. 26, 2018
Defined Contribution Plan Disclosure [Line Items]      
Employer contributions $ 1.5 $ 1.9 $ 2.2
Qualified Plan      
Defined Contribution Plan Disclosure [Line Items]      
Maximum annual contribution per employee 25.00%    
Employer matching contribution 4.00%    
Nonqualified Plan      
Defined Contribution Plan Disclosure [Line Items]      
Maximum annual contribution per employee 50.00%    
Maximum incentive compensation deferral 75.00%