Goodwill and Intangible Assets - Narrative (Details) - USD ($)	3 Months Ended					12 Months Ended
	Dec. 31, 2023	Jul. 02, 2023	Dec. 25, 2022	Sep. 25, 2022	Sep. 26, 2021	Dec. 31, 2023	Dec. 25, 2022	Dec. 26, 2021
Finite-Lived Intangible Assets [Line Items]
Pre-tax non-cash goodwill impairment charges				$ 11,800,000		$ 1,191,200,000	$ 11,800,000
Goodwill impairment	$ 960,000,000	$ 231,200,000	$ 0			1,191,200,000	0	$ 0
Proceeds from sale of business, net of cash transferred						$ 329,600,000	$ 0	378,500,000
Impairment of intangible assets, finite-lived	$ 51,000,000	$ 65,000,000	$ 281,000,000
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]			Selling, distribution and administration
Disposed of by Sale | eOne Music
Finite-Lived Intangible Assets [Line Items]
Goodwill impairment								$ 108,800,000
Proceeds from sale of business, net of cash transferred					$ 397,000,000