Significant Accounting Policies - Government incentives (Details) $ in Millions	12 Months Ended
	Dec. 28, 2024 USD ($)
Government Assistance [Line Items]
Government incentive receivable, current	$ 5.2
Government Assistance, Asset, Current, Statement of Financial Position [Extensible Enumeration]	Prepaid expenses and other current assets
Government incentive receivable, noncurrent	$ 4.9
Government Assistance, Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other assets, net
Government Assistance, Asset, Decrease, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Property and equipment, net
Decrease in property, plant and equipment from government incentives	$ 1.1
Cost of revenues
Government Assistance [Line Items]
Government Assistance, Operating Expense, Decrease (Increase), Statement of Income or Comprehensive Income [Extensible Enumeration]	Cost of revenues
Decrease in operating expense from government incentives	$ 0.7
Research and development
Government Assistance [Line Items]
Government Assistance, Operating Expense, Decrease (Increase), Statement of Income or Comprehensive Income [Extensible Enumeration]	Research and development
Decrease in operating expense from government incentives	$ 4.0