Industry Segment, Geographic Information and Significant Customers (Details Textual) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Document Period End Date									Dec. 28, 2019
Revenue	$ 426,778	$ 289,399	$ 260,172	$ 237,661	$ 384,665	$ 264,534	$ 226,317	$ 217,068	$ 1,214,010	$ 1,092,584	$ 883,911
Customer Concentration Risk | Revenue | Amazon [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage									21.30%	17.30%	13.50%
Non-US [Member] | Geographic Concentration Risk | Revenue
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk percentage									50.30%	48.70%	48.80%
Domestic Destination [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									$ 603,618	$ 560,995	$ 452,563
Geographic Distribution, Foreign [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									$ 610,392	$ 531,589	$ 431,348