Summary of Significant Accounting Policies - Property and equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 28, 2024	Dec. 30, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Impairment of property and equipment	$ 4.3	$ 0.0	$ 0.0
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]	Selling, general and administrative
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	7 years
Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	3 years
Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, useful life	15 years