Fair value measurement - Narratives (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2023	Dec. 31, 2022	Jan. 01, 2022
Debt Instrument
Impairment of fixed and other assets	$ 0.1	$ 1.1	$ 0.6
Secured Credit Facilities | Secured Debt | SOFR
Debt Instrument
Variable rate (as a percent)	0.75%
Two Dollar Term Loan | Term loan | SOFR
Debt Instrument
Variable rate (as a percent)	0.50%