Goodwill and Intangible Assets - Summary of Aggregate Goodwill (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 27, 2025	Dec. 26, 2025	Dec. 27, 2024	Dec. 29, 2023
Goodwill [Roll Forward]
Beginning balance		$ 265.3	$ 265.2
HIS fair value adjustment			0.1
Impairment of goodwill	$ (151.1)	(151.1)	0.0	$ 0.0
Ending balance		114.2	265.3	265.2
Products
Goodwill [Roll Forward]
Beginning balance		191.8	191.7
HIS fair value adjustment			0.1
Impairment of goodwill	(77.6)	(77.6)
Ending balance		114.2	191.8	191.7
Services
Goodwill [Roll Forward]
Beginning balance		73.5	73.5
HIS fair value adjustment			0.0
Impairment of goodwill	$ (73.5)	(73.5)
Ending balance		$ 0.0	$ 73.5	$ 73.5