Business Combination - Supplemental Pro Forma Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019
Pro Forma Results
Revenues		$ 5,936,000
Net earnings attributable to Hasbro, Inc.		351,313
Net earnings attributable to Hasbro, Inc.		$ 345,911
Earnings per share attributable to Hasbro, Inc.: Diluted (in dollars per share)		$ 2.51
Earnings per share attributable to Hasbro, Inc.: Basic (in dollars per share)		$ 2.51
Operating Segments | eOne
Business Acquisition [Line Items]
Net revenues	$ 957,471
Operating Segments | eOne Acquisition
Business Acquisition [Line Items]
Loss before income taxes	$ (112,378)