Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($)	3 Months Ended	9 Months Ended	12 Months Ended
	Dec. 29, 2019	Sep. 26, 2021	Dec. 26, 2021	Dec. 27, 2020
Goodwill [Roll Forward]
Beginning goodwill		$ 3,691,700,000	$ 3,691,700,000	$ 494,600,000
Goodwill allocation			0
Goodwill associated with disposal of business			(162,200,000)
Impairment during the period		0	(108,800,000)
Foreign exchange translation			(1,100,000)	1,300,000
Acquired during the period				3,195,800,000
Ending goodwill	$ 494,600,000		3,419,600,000	3,691,700,000
eOne Acquisition
Goodwill [Roll Forward]
Beginning goodwill		3,200,000,000	3,200,000,000
Goodwill allocation				0
Ending goodwill				3,200,000,000
Consumer Products
Goodwill [Roll Forward]
Beginning goodwill		1,385,700,000	1,385,700,000	430,100,000
Goodwill allocation			199,400,000
Goodwill associated with disposal of business			0
Impairment during the period			0
Foreign exchange translation			(200,000)	1,200,000
Acquired during the period				400,000
Ending goodwill	430,100,000		1,584,900,000	1,385,700,000
Consumer Products | eOne Acquisition
Goodwill [Roll Forward]
Goodwill allocation				954,000,000.0
Wizards of the Coast and Digital Gaming
Goodwill [Roll Forward]
Beginning goodwill		53,100,000	53,100,000	52,700,000
Goodwill allocation			254,200,000
Goodwill associated with disposal of business			0
Impairment during the period	(86,300,000)		0
Foreign exchange translation			0	400,000
Acquired during the period				0
Ending goodwill	52,700,000		307,300,000	53,100,000
Wizards of the Coast and Digital Gaming | eOne Acquisition
Goodwill [Roll Forward]
Goodwill allocation				0
Entertainment
Goodwill [Roll Forward]
Beginning goodwill		$ 2,252,900,000	2,252,900,000	11,800,000
Goodwill allocation			(453,600,000)
Goodwill associated with disposal of business			(162,200,000)
Impairment during the period			(108,800,000)
Foreign exchange translation			(900,000)	(300,000)
Acquired during the period				3,195,400,000
Ending goodwill	$ 11,800,000		$ 1,527,400,000	2,252,900,000
Entertainment | eOne Acquisition
Goodwill [Roll Forward]
Goodwill allocation				$ (954,000,000.0)