Debt and Credit Sources - Non-recourse Debt (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 27, 2020	Dec. 29, 2013	Dec. 29, 2019
Debt Instrument [Line Items]
Non-recourse financing arrangements	$ 15,700
Arizona loan2
Debt Instrument [Line Items]
Non-recourse financing arrangements	5,742		$ 6,111
Arizona loan2 | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread		4.13%
Other debt
Debt Instrument [Line Items]
Non-recourse financing arrangements	$ 9,917		$ 3,004
Other debt | Minimum
Debt Instrument [Line Items]
Expiration period	85 days
Other debt | Maximum
Debt Instrument [Line Items]
Expiration period	9 months