Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018	Dec. 30, 2018
Effective Income Tax Rate	29.20%	29.30%	24.90%	11.60%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%	21.00%
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	$ 889	$ 798	$ 2,925	$ 6,891
(Provision for) benefit from income taxes	(13,353)	$ (12,388)	(21,343)	(6,582)
Decrease in Unrecognized Tax Benefits is Reasonably Possible	7,760		7,760
Income Taxes Receivable	7,572		7,572		$ 14,475
Income Taxes Receivable, Noncurrent	$ 0		$ 0		$ 0
Tax Act
(Provision for) benefit from income taxes				2,795
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount				4,750
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount				$ (1,955)