Segment Reporting - Net Revenues by Product Category (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Revenue from External Customer [Line Items]
Net revenues	$ 1,105,570	$ 732,510
Franchise Brands
Revenue from External Customer [Line Items]
Net revenues	396,497	393,574
Partner Brands
Revenue from External Customer [Line Items]
Net revenues	182,331	171,989
Hasbro Gaming (1)
Revenue from External Customer [Line Items]
Net revenues	140,084	107,565
Emerging Brands (2)
Revenue from External Customer [Line Items]
Net revenues	94,145	59,382
TV/Film/Entertainment (3)
Revenue from External Customer [Line Items]
Net revenues	$ 292,513	$ 0