Other - Interest Expense and Other, Net (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 27, 2020	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Other Income and Expenses [Abstract]
Interest income and other expense, net									$ 24,057	$ 21,580	$ 14,510
Interest expense									(757)	(26,928)	(28,134)
Amortization of debt costs and discount on debt									0	1,459	(3,394)
Capitalized interest									30	69	452
Total interest income/(expense) and other, net	$ 3,153	$ 3,537	$ 2,786	$ 13,854	$ (248)	$ (755)	$ (1,514)	$ (1,303)	23,330	(3,820)	$ (16,566)
Interest income and other expense, net	$ 10,100								$ 10,100
Fair value adjustment					$ 1,900					$ 1,900