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Shareholders' equity and share-based payments - SunPower Restricted Stocks (Details) - Sun Power restricted stocks
EquityInstruments in Thousands
12 Months Ended
Jan. 01, 2018
USD ($)
EquityInstruments
Dec. 31, 2016
USD ($)
EquityInstruments
Jan. 02, 2016
USD ($)
EquityInstruments
Share-based payments      
Number outstanding as of the beginning of the period | EquityInstruments 6,147 5,063 6,555
Shares granted | EquityInstruments 4,863 4,978 2,695
Shares vested | EquityInstruments (1,738) (2,837) (3,560)
Shares forfeited | EquityInstruments (1,979) (1,057) (627)
Number outstanding as of the end of the period | EquityInstruments 7,293 6,147 5,063
Weighted-average grant date fair value of outstanding shares as of the beginning of the period | $ $ 21.85 $ 26.68 $ 18.88
Weighted-average grant date fair value of granted shares | $ 6.76 18.81 29.77
Weighted-average grant date fair value of vested shares | $ 25.87 23.47 15.31
Weighted-average grant date fair value of forfeited shares | $ 18.15 26.30 22.99
Weighted-average grant date fair value of outstanding shares as of the end of the period | $ $ 21.85 $ 21.85 $ 26.68