Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017
Allowance for Doubtful Accounts
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 0	$ 0	$ 0
Charged to Costs and Expenses	0	0	0
Deductions/ Write-offs	0	0	0
Balance at End of Period	0	0	0
Allowance for Deferred Tax Assets
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	55,931	79,150	69,349
Charged to Costs and Expenses	0	0	9,801
Deductions/ Write-offs	(1,018)	(23,219)	0
Balance at End of Period	$ 54,913	$ 55,931	$ 79,150