Debt and Credit Sources - Non-recourse Debt (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Apr. 04, 2021	Jun. 29, 2014	Jan. 03, 2021
Debt Instrument [Line Items]
Non-recourse financing arrangements	$ 151,500
PNC Energy Capital Loan
Debt Instrument [Line Items]
Non-recourse financing arrangements	5,478		$ 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]
Non-recourse financing arrangements	68,977		32,690
Safe Harbor
Debt Instrument [Line Items]
Non-recourse financing arrangements	74,243		75,910
Other debt
Debt Instrument [Line Items]
Non-recourse financing arrangements	2,845		560
Various construction project debt
Debt Instrument [Line Items]
Non-recourse financing arrangements	$ 0		$ 9,583
Various construction project debt | Minimum
Debt Instrument [Line Items]
Expiration period	85 days
Various construction project debt | Maximum
Debt Instrument [Line Items]
Expiration period	9 months