Debt and Credit Sources - Non-recourse Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2013	Oct. 03, 2021	Jan. 03, 2021
Debt Instrument [Line Items]
Total Recourse Debt		$ 104,079	$ 114,145
Total Non-Recourse Debt		4,307	10,143
PNC Energy Capital Loan
Debt Instrument [Line Items]
Total Recourse Debt		0	5,545
PNC Energy Capital Loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread	4.13%
Asset-Backed Loan
Debt Instrument [Line Items]
Total Recourse Debt		41,662	32,690
Safe Harbor
Debt Instrument [Line Items]
Total Recourse Debt		62,417	75,910
Vendor financing and other debt
Debt Instrument [Line Items]
Total Non-Recourse Debt		4,307	560
Construction project debt
Debt Instrument [Line Items]
Total Non-Recourse Debt		$ 0	$ 9,583