Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ 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
Quarterly Financial Information Disclosure [Abstract]
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
Operating profit (loss) (a)	186,364	336,558	2,175	(23,283)	190,380	297,210	128,333	36,127	501,814	652,050	331,052
Earnings (loss) before income taxes	138,474	299,198	(43,728)	(71,882)	298,761	259,746	6,108	29,595	322,062	594,210
Net earnings (loss)	106,166	219,983	(32,898)	(67,810)					225,441	520,454	220,434
Net earnings attributable to Hasbro, Inc.	$ 105,173	$ 220,898	$ (33,915)	$ (69,637)	$ 267,345	$ 212,949	$ 13,433	$ 26,727	$ 222,519	$ 520,454	$ 220,434
Net earnings
Basic (in dollars per share)	$ 0.77	$ 1.61	$ (0.25)	$ (0.51)	$ 2.02	$ 1.68	$ 0.11	$ 0.21	$ 1.62	$ 4.07	$ 1.75
Diluted (in dollars per share)	0.76	1.61	(0.25)	(0.51)	2.01	1.67	0.11	0.21	1.62	4.05	1.74
Market price
High (in dollars per share)	97.13	83.26	83.99	109.50	123.05	126.87	108.86	93.19	109.50	126.87
Low (in dollars per share)	77.29	70.78	60.20	41.33	92.59	103.04	84.61	77.34	41.33	77.34
Cash dividends declared	$ 0.68	$ 0.68	$ 0.68	$ 0.68	$ 0.68	$ 0.68	$ 0.68	$ 0.68	$ 2.72	$ 2.72	$ 2.52