Revenue Recognition - Narrative (Details) $ in Thousands	9 Months Ended
	Sep. 27, 2020 USD ($) brand_category	Dec. 29, 2019 USD ($)	Sep. 29, 2019 USD ($)
Disaggregation of Revenue [Line Items]
Contract assets	$ 356,678		$ 45,001
Prepaid expenses and other current assets	271,786		32,199
Contract assets - long term	84,892		12,802
Contract liabilities - current	147,554		48,465
Other liabilities	$ 778,514	$ 556,559	$ 550,778
Number of brand categories | brand_category	5
eOne
Disaggregation of Revenue [Line Items]
Contract assets	$ 283,329
Prepaid expenses and other current assets	232,184
Contract assets - long term	51,145
Deferred revenue	152,266
Contract liabilities - current	144,094
Other liabilities	$ 8,172
Contract asset, balance, percentage	80.00%
Contract liability, balance, percentage	56.00%