Revenue from Contracts with Customers - Performance Obligations (Details) $ in Millions	9 Months Ended
Sep. 27, 2020 USD ($)
Various Distribution Generation Projects
Disaggregation of Revenue [Line Items]
Percentage of revenue recognized	76.90%
Solar power systems sales and EPC services
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, amount	$ 140.5
Modules and components [Member]
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, amount	$ 211.9

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

Name:	us-gaap_RevenueRemainingPerformanceObligation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant