Segment Reporting - Net Revenues by Product Category (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Revenue from External Customer [Line Items]
Net revenues	$ 860,279	$ 984,537	$ 1,965,849	$ 1,717,047
Franchise Brands
Revenue from External Customer [Line Items]
Net revenues	376,826	576,715	773,323	970,289
Partner Brands
Revenue from External Customer [Line Items]
Net revenues	138,227	213,448	320,558	385,437
Hasbro Gaming (1)
Revenue from External Customer [Line Items]
Net revenues	137,031	123,420	277,115	230,985
Emerging Brands (2)
Revenue from External Customer [Line Items]
Net revenues	75,991	70,954	170,136	130,336
TV/Film/Entertainment (3)
Revenue from External Customer [Line Items]
Net revenues	$ 132,204	$ 0	$ 424,717	$ 0