Restructuring - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended				6 Months Ended		9 Months Ended
	Apr. 30, 2021 USD ($)	Jul. 04, 2021 USD ($)	Apr. 04, 2021 employee	Jun. 28, 2020 USD ($)	Dec. 29, 2019 employee	Jul. 04, 2021 USD ($)	Jun. 28, 2020 USD ($)	Jun. 30, 2020 employee
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 808		$ 1,259		$ 4,574	$ 2,835
January 2021 Restructuring Plan:
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 1,200
Restructuring incurred cost						3,600
December 2019 Restructuring Plan:
Restructuring Cost and Reserve [Line Items]
Restructuring incurred cost						11,000
Facility Closing | January 2021 Restructuring Plan:
Restructuring Cost and Reserve [Line Items]
Reorganization, number of jobs affected | employee			170
Facility Closing | January 2021 Restructuring Plan: | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, exiting period			3 months
Facility Closing | January 2021 Restructuring Plan: | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, exiting period			6 months
Spinoff | January 2021 Restructuring Plan: | Minimum
Restructuring Cost and Reserve [Line Items]
Restructuring charges						7,000
Severance costs						4,000
Real estate lease termination and other associated costs						3,000
Spinoff | January 2021 Restructuring Plan: | Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring charges						9,000
Severance costs						5,000
Real estate lease termination and other associated costs						$ 4,000
Spinoff | December 2019 Restructuring Plan: | Minimum
Restructuring Cost and Reserve [Line Items]
Reorganization, number of jobs affected | employee					145
Restructuring and related cost, exiting period					12 months
Reorganization, number of jobs affected as a percentage of global workforce					3.00%
Spinoff | December 2019 Restructuring Plan: | Minimum | SunPower Technologies
Restructuring Cost and Reserve [Line Items]
Reorganization, number of jobs affected | employee					65
Spinoff | December 2019 Restructuring Plan: | Minimum | SunPower Energy Services
Restructuring Cost and Reserve [Line Items]
Reorganization, number of jobs affected | employee								80
Spinoff | December 2019 Restructuring Plan: | Maximum
Restructuring Cost and Reserve [Line Items]
Reorganization, number of jobs affected | employee					160
Restructuring and related cost, exiting period					18 months
Spinoff | December 2019 Restructuring Plan: | Maximum | SunPower Technologies
Restructuring Cost and Reserve [Line Items]
Reorganization, number of jobs affected | employee					70
Spinoff | December 2019 Restructuring Plan: | Maximum | SunPower Energy Services
Restructuring Cost and Reserve [Line Items]
Reorganization, number of jobs affected | employee								90