Business Combination - Supplemental Pro Forma Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 28, 2020	Mar. 29, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Business Acquisition [Line Items]
Net revenues	$ 860,279		$ 984,537	$ 1,965,849	$ 1,717,047
Pro Forma Results
Revenues			1,215,628		2,414,350
Net earnings (loss) attributable to Hasbro, Inc.			(42,219)		36,499
Net earnings (loss) attributable to Hasbro, Inc.			$ (42,621)		$ 33,907
Earnings per share attributable to Hasbro, Inc.: Diluted (in dollars per share)			$ (0.31)		$ 0.25
Earnings per share attributable to Hasbro, Inc.: Basic (in dollars per share)			$ (0.31)		$ 0.25
Operating Segments | eOne
Business Acquisition [Line Items]
Net revenues	$ 160,922		$ 0	503,415	$ 0
Operating Segments | eOne
Business Acquisition [Line Items]
Loss before income taxes		$ (11,028)		$ (44,648)