Business Combination - Supplemental Pro Forma Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 27, 2020	Sep. 29, 2019
Business Acquisition [Line Items]
Net revenues	$ 1,776,623	$ 1,575,173	$ 3,742,472	$ 3,292,220
Pro Forma Results
Revenues		1,858,483		4,272,833
Net earnings attributable to Hasbro, Inc.		218,858		255,357
Net earnings attributable to Hasbro, Inc.		$ 216,536		$ 250,443
Earnings per share attributable to Hasbro, Inc.: Diluted (in dollars per share)		$ 1.57		$ 1.82
Earnings per share attributable to Hasbro, Inc.: Basic (in dollars per share)		$ 1.57		$ 1.82
Operating Segments | eOne
Business Acquisition [Line Items]
Net revenues	193,474	$ 0	696,889	$ 0
Operating Segments | eOne
Business Acquisition [Line Items]
Loss before income taxes	$ (30,793)		$ (75,441)