Fair Value Measurements (Details) - USD ($) shares in Millions	1 Months Ended	12 Months Ended
	Nov. 30, 2014	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other than Temporary Impairment Losses, Investments		$ 0
Customer Advances and Deposits, Related Party		175,000	$ 57,000
Accrued liabilities:
Derivative financial instruments (Note 12)		1,452,000	2,023,000
Other long-term liabilities:
Derivative financial instruments (Note 12)		1,174,000	448,000
Related Party Transactions [Abstract]
Accounts receivable		1,275,000	3,397,000
Accounts payable		3,764,000	0
Other long-term liabilities		0	723,000
Notes Payable, Related Parties		29,245,000	29,370,000
Payments made to investees for products/services		0	337,831,000	$ 444,121,000
Restricted long-term marketable securities		6,238,000	4,971,000
Restricted long-term marketable securities		6,238,000	4,971,000
Equity method investments1		15,515,000	6,931,000
Cost method investments		35,840,000	39,423,000
Accrued liabilities, related party		4,161,000	3,665,000
Revenue from sales to investees of products/services		31,459,000	317,314,000	$ 47,019,000
Fair Value, Measurements, Recurring [Member]
Cash and cash equivalents:
Money market funds		0	3,002,000
Prepaid expenses and other current assets:
Derivative financial instruments (Note 12)		2,579,000	4,802,000
Derivative Asset		0	11,429,000
Other long-term assets:
Total assets		2,579,000	19,233,000
Accrued liabilities:
Derivative financial instruments (Note 12)		1,452,000	2,023,000
Other long-term liabilities:
Derivative financial instruments (Note 12)		1,174,000	448,000
Total liabilities		2,626,000	2,471,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents:
Money market funds		0	3,002,000
Prepaid expenses and other current assets:
Derivative financial instruments (Note 12)		0	0
Derivative Asset		0	0
Other long-term assets:
Total assets		0	3,002,000
Accrued liabilities:
Derivative financial instruments (Note 12)		0	0
Other long-term liabilities:
Derivative financial instruments (Note 12)		0	0
Total liabilities		0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents:
Money market funds		0	0
Prepaid expenses and other current assets:
Derivative financial instruments (Note 12)		2,579,000	4,802,000
Derivative Asset		0	11,429,000
Other long-term assets:
Total assets		2,579,000	16,231,000
Accrued liabilities:
Derivative financial instruments (Note 12)		1,452,000	2,023,000
Other long-term liabilities:
Derivative financial instruments (Note 12)		1,174,000	448,000
Total liabilities		$ 2,626,000	$ 2,471,000
Tendril Networks Inc [Member] | Preferred Stock [Member]
Fair Value Inputs, Quantitative Information [Abstract]
Cost method investment, original cost	$ 20,000,000
Tendril Networks Inc [Member] | Common Stock [Member]
Fair Value Inputs, Quantitative Information [Abstract]
Cost method investment, agreement to purchase additional interest (in shares)	14
SunPower Inc [Member] | Tendril Networks Inc [Member] | Master Services Agreement and Statement of Works [Member]
Fair Value Inputs, Quantitative Information [Abstract]
Cost method investments, joint investment in development project	$ 13,000,000