Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 10,309	$ 11,629	$ 17,086
Gross additions to tax positions taken during the current year	1,130	1,184	680
Gross additions to tax positions taken during the prior year	133	711	3,019
Gross reductions to tax positions taken during the prior year	(93)	(76)	(8,607)
Reductions from settlements with taxing authorities	(3,814)	(2,637)	0
Reductions from lapse of applicable statutes of limitations	(928)	(502)	(549)
Balance at end of year	$ 6,737	$ 10,309	$ 11,629