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Related Party Transactions - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024	Dec. 28, 2024	Apr. 03, 2018
Related Party Transaction [Line Items]
Selling, general and administrative	$ 760.0	$ 724.0	$ 2,276.0	$ 2,296.0
Current operating lease liabilities	81.0		81.0		$ 75.0
Noncurrent operating lease liabilities	264.0		264.0		259.0
Equity Method Investee [Member]
Related Party Transaction [Line Items]
Other liabilities	7.0		7.0		6.0
Due from related party	32.0		32.0		31.0
Revenues	14.0	14.0	42.0	38.0
Purchases from related party	3.0	3.0	7.0	8.0
Employees and Minority Shareholders [Member]
Related Party Transaction [Line Items]
Current operating lease liabilities	5.0		5.0		6.0
Noncurrent operating lease liabilities	$ 23.0		$ 23.0		$ 20.0
Employees and Minority Shareholders [Member] | Operating Lease Liabilities, Current [Member] | Related Party Concentration Risk[Member]
Related Party Transaction [Line Items]
Concentration risk percentage			6.50%		7.60%
Employees and Minority Shareholders [Member] | Operating Lease Liabilities, Non-Current [Member] | Related Party Concentration Risk[Member]
Related Party Transaction [Line Items]
Concentration risk percentage			8.70%		7.80%
Employees and Minority Shareholders [Member] | Minimum [Member]
Related Party Transaction [Line Items]
Remaining operating lease term	1 year		1 year
Employees and Minority Shareholders [Member] | Maximum [Member]
Related Party Transaction [Line Items]
Remaining operating lease term	12 years		12 years
Internet Brands Inc [Member] | Co Venturer [Member]
Related Party Transaction [Line Items]
Extend time-based trigger and pause exercise of put option, period (in years)			4 years
Internet Brands Inc [Member] | Co Venturer [Member] | Royalty Agreements [Member]
Related Party Transaction [Line Items]
Period covered by agreement			10 years
Related party agreement amount			$ 31.0
Selling, general and administrative	$ 8.0	$ 8.0	$ 23.0	$ 23.0
Internet Brands Inc [Member] | Henry Schein One LLC [Member]
Related Party Transaction [Line Items]
Minority interest ownership percentage	33.60%		33.60%			26.00%
Henry Schein One LLC [Member] | Internet Brands Inc [Member] | Affiliated Entity [Member]
Related Party Transaction [Line Items]
Other liabilities	$ 1.0		$ 1.0		$ 1.0

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