Segment Reporting - Other Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 27, 2020	Sep. 27, 2020	Jun. 28, 2020	Mar. 29, 2020	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Product Information [Line Items]
Net revenues	$ 1,722,971	$ 1,776,623	$ 860,279	$ 1,105,570	$ 1,428,007	$ 1,575,173	$ 984,537	$ 732,510	$ 5,465,443	$ 4,720,227	$ 4,579,646
Wal-mart stores, Inc.
Product Information [Line Items]
Concentration risk, percentage									15.00%	18.00%	20.00%
Target corporation
Product Information [Line Items]
Concentration risk, percentage									10.00%	9.00%	9.00%
Amazon.com. Inc.
Product Information [Line Items]
Concentration risk, percentage									8.00%	8.00%
Class Of principal product hasbro total gaming
Product Information [Line Items]
Net revenues									$ 1,763,793	$ 1,528,283	$ 1,443,164