Segment Reporting - Net Revenues by Product Category (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Revenue from External Customer [Line Items]
Net revenues	$ 1,428,007	$ 1,575,173	$ 984,537	$ 732,510	$ 1,389,161	$ 1,569,686	$ 904,458	$ 716,341	$ 4,720,227	$ 4,579,646	$ 5,209,782
Franchise Brands
Revenue from External Customer [Line Items]
Net revenues									2,411,847	2,445,902	2,690,394
Partner Brands
Revenue from External Customer [Line Items]
Net revenues									1,220,982	987,283	1,271,597
Hasbro Gaming
Revenue from External Customer [Line Items]
Net revenues									709,750	787,692	893,019
Emerging Brands
Revenue from External Customer [Line Items]
Net revenues									$ 377,648	$ 358,769	$ 354,772