Other Expense, Net - Schedule of Other Expense, Net (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 28, 2025	Sep. 29, 2024	Sep. 28, 2025	Sep. 29, 2024
Schedule of Other Expense Net [Abstract]
Loss on issuance of derivative liabilities	[1]		$ (24,688)		$ (24,688)
Change in fair value of derivative liabilities	[2]	(2,034)	(37,875)	1,639	(37,875)
Change in fair value of forward purchase agreement liabilities	[3]	(2,420)	7,728	(807)	4,906
Change in fair value of SAFE Agreement with related party		(79)	(900)	(113)	(900)
Change in fair value of FACT public, private placement and working capital warrants		(78)	(6,052)	(3,122)	(6,295)
Change in fair value of Carlyle Warrants with related party					2,869
Change in fair value of redeemable convertible preferred stock warrant liability					1,310
Loss on conversion of SAFE Agreements to common stock with related party					(1,250)
Other financing costs			(3,812)		(3,812)
Other, net	[4]	355	(85)	679	(499)
Total Other Expense, net	[5]	$ (4,256)	$ (65,684)	$ (1,724)	$ (66,234)

[1] Includes $3.0 million of related party expense in each of the thirteen and thirty-nine week periods ended September 29, 2024.

[2] Includes a loss of $0.3 million and a gain of $1.8 million due to related parties in the thirteen and thirty-nine week periods ended September 28, 2025, respectively. Includes a loss of $22.8 million due to related parties in each of the thirteen and thirty-nine week periods ended September 29, 2024. Refer to Note 9 – Borrowings and Derivative Liabilities for details.

[3] Includes a gain of zero and $0.1 million due to related parties for the thirteen and thirty-nine week periods ended September 28, 2025, respectively. Includes a gain from related parties of $2.8 million and $1.8 million due to related parties in the thirteen and thirty-nine week periods ended September 29, 2024, respectively.

[4] Includes zero and $0.1 million of income due to related parties in the thirteen and thirty-nine week periods ended September 28, 2025, respectively.

[5] Includes the following related party transactions (in millions):