Summary of Significant Accounting Policies - Schedule of Earnings per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 30, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 29, 2019	Dec. 30, 2018	Dec. 31, 2017
Net earnings (loss)
Net earnings attributable to Hasbro, Inc.	$ 267,345	$ 212,949	$ 13,433	$ 26,727	$ 8,766	$ 263,861	$ 60,299	$ (112,492)	$ 520,454	$ 220,434	$ 396,607
Average shares outstanding, basic and diluted (in shares)									127,896	126,132	125,039
Earnings Per Share, Basic [Abstract]
Equivalent shares (in shares)									127,896	126,132	125,039
Net earnings attributable to Hasbro, Inc. (in dollars per share)	$ 2.02	$ 1.68	$ 0.11	$ 0.21	$ 0.07	$ 2.08	$ 0.48	$ (0.90)	$ 4.07	$ 1.75	$ 3.17
Effect of dilutive securities:
Options and other share-based awards (in shares)									603	758	1,992
Equivalent shares (in shares)									128,499	126,890	127,031
Net earnings attributable to Hasbro, Inc. (in dollars per share)	$ 2.01	$ 1.67	$ 0.11	$ 0.21	$ 0.07	$ 2.06	$ 0.48	$ (0.90)	$ 4.05	$ 1.74	$ 3.12