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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 26, 2020
Dec. 28, 2019
Dec. 29, 2018
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period $ 11,316 $ 10,055 $ 11,435
Additions Charged to Costs and Expenses 12,171 3,585 3,309
Deductions (1,548) (2,324) (4,689)
Balance at End of Period 21,939 11,316 10,055
Allowance for doubtful accounts [Member]      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 6,754 5,487 4,168
Additions Charged to Costs and Expenses 5,259 2,029 2,123
Deductions (927) (762) (804)
Balance at End of Period 11,086 6,754 5,487
Valuation allowance - Deferred Tax Asset [Member]      
Valuation And Qualifying Accounts Disclosure [Line Items]      
Balance at Beginning of Period 4,562 4,568 7,267
Additions Charged to Costs and Expenses 6,912 1,556 1,186
Deductions (621) (1,562) (3,885)
Balance at End of Period $ 10,853 $ 4,562 $ 4,568