Goodwill and Intangible Assets - Purchased Intangible Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 27, 2024	Dec. 29, 2023
Finite Lived Intangible Assets [Line Items]
Accumulated Amortization	$ (190.7)	$ (160.3)
Total	175.9
Intangible Assets, gross carrying value	375.6	375.6
Intangible Assets, net carrying value	184.9	215.3
UCT Tradename
Finite Lived Intangible Assets [Line Items]
Indefinite lived intangible assets acquired	9.0
Customer relationships
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	207.2	207.2
Accumulated Amortization	(117.4)	(97.5)
Total	$ 89.8	109.7
Customer relationships | Minimum
Finite Lived Intangible Assets [Line Items]
Useful Life (In years)	6 years
Customer relationships | Maximum
Finite Lived Intangible Assets [Line Items]
Useful Life (In years)	10 years
Recipes
Finite Lived Intangible Assets [Line Items]
Useful Life (In years)	20 years
Gross Carrying Amount	$ 73.2	73.2
Accumulated Amortization	(23.2)	(19.5)
Total	50.0	53.7
Intellectual property/knowhow
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	48.9	48.9
Accumulated Amortization	(22.8)	(18.4)
Total	$ 26.1	30.5
Intellectual property/knowhow | Minimum
Finite Lived Intangible Assets [Line Items]
Useful Life (In years)	7 years
Intellectual property/knowhow | Maximum
Finite Lived Intangible Assets [Line Items]
Useful Life (In years)	15 years
Tradename
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 32.5	32.5
Accumulated Amortization	(22.9)	(22.1)
Total	$ 9.6	10.4
Tradename | Minimum
Finite Lived Intangible Assets [Line Items]
Useful Life (In years)	4 years
Tradename | Maximum
Finite Lived Intangible Assets [Line Items]
Useful Life (In years)	6 years
Standard operating procedures
Finite Lived Intangible Assets [Line Items]
Useful Life (In years)	20 years
Gross Carrying Amount	$ 8.6	8.6
Accumulated Amortization	(2.7)	(2.3)
Total	$ 5.9	6.3
Developed technology
Finite Lived Intangible Assets [Line Items]
Useful Life (In years)	5 years
Gross Carrying Amount	$ 4.6	4.6
Accumulated Amortization	(1.1)	(0.2)
Total	$ 3.5	4.4
Backlog
Finite Lived Intangible Assets [Line Items]
Useful Life (In years)	1 year
Gross Carrying Amount	$ 0.6	0.6
Accumulated Amortization	(0.6)	(0.3)
Total	$ 0.0	$ 0.3