Equity Investments - SunStrong LLC (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
Schedule of Investments [Line Items]
Gross loss	$ 19,800	$ (309,961)	$ (17,485)	$ (299,387)
Net income	121,459	$ (447,117)	31,735	$ (563,091)
Current assets	1,011,440		1,011,440		$ 1,073,771
Current liabilities	770,796		770,796		705,006
SunStrong Capital Holdings, LLC
Schedule of Investments [Line Items]
Revenue	22,626		22,626
Gross loss	(1,209)		(1,209)
Net income	3,256		3,256
Current assets	47,019		47,019		103,413
Long-term assets	867,082		867,082		868,185
Current liabilities	23,696		23,696		85,154
Long-term liabilities	$ 662,765		$ 662,765		$ 660,065