Business Combination - Narrative (Details) £ / shares in Units, $ / shares in Units, £ in Thousands			1 Months Ended	3 Months Ended				12 Months Ended
	Dec. 30, 2019 USD ($) $ / shares	Dec. 30, 2019 GBP (£)	Nov. 30, 2019 USD ($) $ / shares shares	Dec. 27, 2020 USD ($) shares	Sep. 27, 2020 USD ($)	Jun. 28, 2020 USD ($)	Mar. 29, 2020 USD ($)	Dec. 27, 2020 USD ($)	Dec. 29, 2019 USD ($)	Dec. 30, 2018 USD ($)	Dec. 30, 2019 £ / shares
Business Acquisition [Line Items]
Common stock, shares issued (in shares) | shares			10,592,000	10,592,000
Goodwill				$ 3,691,709,000				$ 3,691,709,000	$ 494,584,000	$ 485,881,000
Acquisition and related costs								218,566,000	0	0
Restructuring and related cost				11,687,000	$ 1,350,000	$ 6,296,000	$ 54,064,000
Amortization of intangibles									38,823,000
Interest expense									75,351,000
Income tax effect, amount									12,250,000
eOne
Business Acquisition [Line Items]
Goodwill				2,241,396,000				2,241,396,000	0	0
U.S. and Canada
Business Acquisition [Line Items]
Goodwill				812,794,000				812,794,000	291,577,000	296,978,000
International
Business Acquisition [Line Items]
Goodwill				500,336,000				500,336,000	170,218,000	170,361,000
Entertainment, Licensing and Digital
Business Acquisition [Line Items]
Goodwill				137,183,000				137,183,000	32,789,000	$ 18,542,000
eOne Acquisition
Business Acquisition [Line Items]
Payments to acquire businesses	$ 4,635,041,000	£ 2,900,000
Cash consideration per share (in dollars and GBP per share) | (per share)	$ 7.35										£ 5.60
Conversion rate	1.31
Cash consideration for employee share based payment awards outstanding	$ 3,658,345,000
Indebtedness redeemed as consideration for acquisition	831,130,000
Goodwill	3,195,396,000			3,195,749,000				3,195,749,000
Acquisition and related costs								112,417,000
Integration related costs								145,169,000
Restructuring and related cost								73,397,000
Amortization of intangibles								97,856,000
Acquisition costs, period cost									24,267,000
Other expenses									74,752,000
Payment for debt prepayment cost									19,812,000
eOne Acquisition | eOne
Business Acquisition [Line Items]
Goodwill	2,241,396,000
eOne Acquisition | U.S. and Canada
Business Acquisition [Line Items]
Goodwill	521,217,000
eOne Acquisition | International
Business Acquisition [Line Items]
Goodwill	329,612,000
eOne Acquisition | Entertainment, Licensing and Digital
Business Acquisition [Line Items]
Goodwill	$ 103,171,000
eOne Acquisition | Foreign exchange forward
Business Acquisition [Line Items]
Other expenses									$ 94,564,000
Unsecured committed | eOne Acquisition
Business Acquisition [Line Items]
Cash consideration per share (in dollars and GBP per share) | $ / shares			$ 95.00
Term loans proceeds which financed acquisition			$ 1,000,000,000
Senior Notes | Senior Unsecured Notes
Business Acquisition [Line Items]
Aggregate principal amount			2,375,000,000	$ 2,375,000,000				2,375,000,000
Proceeds from issuance of debt			$ 975,185,000
Entertainment, Licensing and Digital | eOne Acquisition
Business Acquisition [Line Items]
Acquisition and related costs								$ 20,831,000
Minimum
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life								2 years
Income tax rate, percent									21.00%
Minimum | Trademarks and Trade Names | eOne Acquisition
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life							7 years
Minimum | Films and Television Programs | eOne Acquisition
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life							3 years
Maximum
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life								25 years
Income tax rate, percent									22.50%
Maximum | Trademarks and Trade Names | eOne Acquisition
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life							15 years
Maximum | Films and Television Programs | eOne Acquisition
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life							10 years