Segment Reporting - Net Revenues by Product Category (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Revenue from External Customer [Line Items]
Net revenues	$ 1,776,623	$ 1,575,173	$ 3,742,472	$ 3,292,220
Franchise Brands
Revenue from External Customer [Line Items]
Net revenues	807,555	779,659	1,580,878	1,749,948
Partner Brands
Revenue from External Customer [Line Items]
Net revenues	409,214	427,029	729,772	812,466
Hasbro Gaming
Revenue from External Customer [Line Items]
Net revenues	239,222	232,287	516,337	463,272
Emerging Brands
Revenue from External Customer [Line Items]
Net revenues	154,965	136,198	325,101	266,534
TV/Film/Entertainment
Revenue from External Customer [Line Items]
Net revenues	$ 165,667	$ 0	$ 590,384	$ 0