Fair Value Measurement - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	Sep. 28, 2025	Jul. 21, 2025	Dec. 29, 2024	Dec. 05, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Money market funds	$ 335.5		$ 272.9
Each whole private placement warrant became exercisable for number of whole shares (in shares)		1
Exercise price of warrants (in dollars per share)		$ 8.75
Warrants outstanding (in shares)		29,233,276
Fair value of the convertible senior notes	611.8
Long-term debt, fair value	$ 0.6		$ 1.5
Private Placement Warrants
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Each whole private placement warrant became exercisable for number of whole shares (in shares)				1
Exercise price of warrants (in dollars per share)		$ 10.66		$ 11.50
Warrants outstanding (in shares)	5,500,000		5,500,000
Level 3 | Fair Value, Recurring | Private Placement Warrants
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Fair value of warrant per share (in dollars per share)	$ 3.02