Income Taxes - Valuation Allowance for Deferred Tax Assets (Details) - Valuation allowance for deferred tax assets - USD ($) $ in Thousands	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 207,108	$ 209,691	$ 260,687
Charged (Credit) to costs and expenses	(8,609)	(2,583)	(50,960)
Charged (credit) to other accounts	0	0	(36)
Balance at end of period	$ 198,499	$ 207,108	$ 209,691