Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 225,441	$ 520,454	$ 220,434
Other comprehensive earnings (loss):
Foreign currency translation adjustments, net of tax	10,087	9,556	(55,524)
Unrealized holding gains (losses) on available-for-sale securities, net of tax	640	514	(2,000)
Net gains on cash flow hedging activities, net of tax	2,380	11,678	36,107
Changes in unrecognized pension amounts, net of tax	(6,609)	14,850	(23,763)
Reclassifications to earnings, net of tax:
Net (gains) losses on cash flow hedging activities	(19,252)	(18,459)	1,929
Amortization of unrecognized pension and postretirement amounts	2,021	6,160	9,665
Settlement of U.S. defined benefit plan	0	85,995	0
Other comprehensive loss	(10,733)	110,294	(33,586)
Total comprehensive earnings, net of tax	214,708	630,748	186,848
Total comprehensive earnings attributable to noncontrolling Interests	2,922	0	0
Total comprehensive earnings attributable to Hasbro, Inc.	$ 211,786	$ 630,748	$ 186,848