eOne Music Sale (Details) - USD ($)		3 Months Ended		9 Months Ended	12 Months Ended
	Jun. 29, 2021	Sep. 26, 2021	Jun. 27, 2021	Sep. 26, 2021	Dec. 26, 2021	Dec. 27, 2020	Dec. 29, 2019	Apr. 25, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business, net of cash					$ 378,500,000	$ 0	$ 0
Loss on disposal of business				$ 0	108,800,000
eOne Music | Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Aggregate sales price			$ 385,000,000					$ 385,000,000
Loss on disposal of business			108,800,000
eOne Music | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Aggregate sales price	$ 385,000,000
Proceeds from sale of business, net of cash	397,000,000	$ 397,000,000
Aggregate sales price, closing adjustments	12,000,000
Net cash outflow, divestiture of business	$ 900,000
Loss on disposal of business					108,800,000
Pre-tax cash transaction expenses			$ 9,500,000
Assets de-consolidated					473,500,000
Liabilities de-consolidated					$ 77,300,000