Business Combination - Narrative (Details) £ / shares in Units, $ / shares in Units, £ in Thousands, shares in Thousands			3 Months Ended		6 Months Ended
	Dec. 30, 2019 USD ($) $ / shares shares	Dec. 30, 2019 GBP (£) shares	Jun. 28, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 28, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 30, 2019 £ / shares	Dec. 29, 2019 USD ($)	Nov. 30, 2019 USD ($)
Business Acquisition [Line Items]
Shares issued as consideration (in shares) | shares	10,592	10,592
Goodwill			$ 3,666,045,000	$ 485,765,000	$ 3,666,045,000	$ 485,765,000		$ 494,584,000
Acquisition and related costs			10,262,000	0	160,044,000	0
Severance expense			11,554,000
Asset impairments					40,878,000	0
Amortization of intangibles				8,572,000		21,052,000
Interest expense				19,106,000		38,211,000
Income tax effect, amount				$ 1,344,000		$ 8,024,000
eOne
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 (USD/GBP)	1.31
Cash consideration for shares outstanding	$ 3,658,345,000
Indebtedness redeemed as consideration for acquisition	831,130,000
Goodwill	3,171,611,000
Acquisition and related costs					77,729,000
Integration related costs			3,966,000		99,684,000
Integration related costs, acceleration of stock-based compensation					47,339,000
Integration related costs, advisor fees					38,168,000
Less: Employee awards to be recorded as future stock compensation expense	$ 47,399,000
Restructuring and related cost			6,296,000		60,360,000
Severance expense			$ 6,296,000		19,482,000
Asset impairments					40,878,000
Unsecured Committed | eOne
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]
Proceeds from Issuance of Debt	975,185,000
Aggregate principal amount	$ 2,375,000,000								$ 2,375,000,000
Entertainment, Licensing and Digital | eOne
Business Acquisition [Line Items]
Acquisition and related costs					$ 20,831,000
Minimum
Business Acquisition [Line Items]
Income tax rate, percent						21.00%
Minimum | Trademarks and Trade Names | eOne
Business Acquisition [Line Items]
Intangible asset useful life					7 years
Minimum | Films and Television Programs | eOne
Business Acquisition [Line Items]
Intangible asset useful life	3 years	3 years
Maximum
Business Acquisition [Line Items]
Income tax rate, percent						22.50%
Maximum | Trademarks and Trade Names | eOne
Business Acquisition [Line Items]
Intangible asset useful life					15 years
Maximum | Films and Television Programs | eOne
Business Acquisition [Line Items]
Intangible asset useful life	10 years	10 years