Schedule II - Valuation and Qualifying Accounts (Details) - Accounts Receivable Allowances - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 14,358	$ 13,249	$ 14,542
Additions charged to operating costs and other	14,783	14,807	11,830
Deductions	15,344	13,698	13,123
Balance at end of period	$ 13,797	$ 14,358	$ 13,249