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Fair value measurement - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 01, 2022
Jan. 02, 2021
Dec. 28, 2019
Debt Instrument      
Asset impairments $ 0.6 $ 5.2 $ 0.7
Secured credit facilities | Secured debt | LIBOR      
Debt Instrument      
Variable rate floor (percent) 0.75%    
Euro Term Loan | Term loan | EURIBOR      
Debt Instrument      
Variable rate floor (percent) 0.00%