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Goodwill - Narrative (Details) $ in Millions		3 Months Ended		9 Months Ended
Goodwill - Narrative (Details) $ in Millions	May 19, 2022 USD ($)	Jun. 27, 2021 USD ($)	Mar. 28, 2021 segment	Sep. 25, 2022 USD ($)	Sep. 26, 2021 USD ($)	Dec. 26, 2021 USD ($)	Dec. 27, 2020 USD ($)
Goodwill [Line Items]
Number of reportable segments \| segment			3
Impairment during the period				$ 11.8	$ 101.8
Goodwill				3,469.8	3,420.2	$ 3,419.6	$ 3,691.7
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| eOne Music
Goodwill [Line Items]
Impairment during the period		$ 101.8			101.8
Wizards of the Coast and Digital Gaming
Goodwill [Line Items]
Impairment during the period				0.0	0.0
Goodwill				$ 371.5	$ 307.5	$ 307.3	$ 53.1
D&D Beyond
Goodwill [Line Items]
Aggregate purchase price	$ 146.3
Goodwill	64.7
D&D Beyond \| Wizards of the Coast and Digital Gaming
Goodwill [Line Items]
Goodwill	$ 64.7