Solar Services - Operating Leases (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019	Dec. 29, 2019
Leases [Abstract]
Solar power systems leased	$ 115,775,000		$ 115,775,000		$ 116,948,000
Solar power systems leased and to be leased, gross	115,775,000		115,775,000		116,948,000
Less: accumulated depreciation and impairment	(64,596,000)		(64,596,000)		(62,610,000)
Solar power systems leased, net	51,179,000		51,179,000		$ 54,338,000
Noncash impairment charge	$ 0	$ 0.0	$ 0	$ 4,000,000.0