Summary of Significant Accounting Policies and Other Information - Cash and cash equivalents (Details) - USD ($) $ in Thousands	Sep. 25, 2021	Dec. 26, 2020	Sep. 26, 2020	Dec. 28, 2019
Accounting Policies [Abstract]
Cash and cash equivalents	$ 690,682	$ 687,525	$ 641,890
Restricted cash included in prepaid expenses and other current assets	3,483	0	0
Restricted cash included in other assets	1,704	0	0
Total cash, cash equivalents and restricted cash	$ 695,869	$ 687,525	$ 641,890	$ 531,139