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Shareholders' equity and share-based payments - Expense (Details)
$ in Thousands
12 Months Ended
Apr. 26, 2017
EUR (€)
shares
Dec. 31, 2017
EUR (€)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Share-based payments          
Share-based expense     $ 182,000 $ 141,000 $ 179,000
TOTAL performance-based restricted share grants          
Share-based payments          
Share-based expense     135,000 113,000 71,000
SunPower Plans          
Share-based payments          
Share-based expense     31,000 $ 28,000 78,000
Capital increase reserved for employees          
Share-based payments          
Share-based expense     $ 16,000   $ 30,000
Assumptions used for the valuation of the cost of the capital          
Subscription price | € € 38.10 € 38.10      
Share price at the reference date | €   € 46.98      
Number of shares | shares 9,350,220 9,350,000 9,350,000    
Risk-free interest rate (as a percent)   0.13% 0.13%    
Employees loan financing rate (as a percent)   5.02% 5.02%    
Non-transferability cost (as a percent)   20.62% 20.62%    
Trading period to determine subscription price   20 days 20 days    
Subscription price discount (as a percent)   20.00% 20.00%    
Euro swap rate term for risk-free interest rate   5 years 5 years    
Consumer's credit rate term for employees loan financing rate   5 years 5 years