Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Dec. 25, 2016	Sep. 25, 2016	Jun. 26, 2016	Mar. 27, 2016	Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015
Quarterly Financial Data (Unaudited) [Abstract]
Net revenues, external	$ 1,596,111	$ 1,791,502	$ 972,506	$ 849,663	$ 1,629,940	$ 1,679,757	$ 878,945	$ 831,180	$ 5,209,782	$ 5,019,822	$ 4,447,509
Operating profit	271,088	360,944	99,984	78,343	255,157	362,101	84,874	85,916	810,359	788,048	691,933
Earnings (loss) before income taxes	278,586	349,841	86,886	70,837	219,932	346,324	67,020	59,213	786,150	692,489
Net earnings	(5,298)	265,583	67,723	68,599	180,599	256,162	49,419	46,971	396,607	533,151	446,872
Net earnings attributable to Hasbro, Inc.	$ (5,298)	$ 265,583	$ 67,723	$ 68,599	$ 192,725	$ 257,798	$ 52,106	$ 48,751	$ 396,607	$ 551,380	$ 451,838
Net earnings (loss) [Abstract]
Basic (in dollars per share)	$ (0.04)	$ 2.12	$ 0.54	$ 0.55	$ 1.54	$ 2.05	$ 0.42	$ 0.39	$ 3.17	$ 4.4	$ 3.61
Diluted (in dollars per share)	(0.04)	2.09	0.53	0.54	1.52	2.03	0.41	0.38	3.12	4.34	3.57
Market price [Abstract]
High (in dollars per share)	99.17	116.2	113.49	101.08	87.96	87	88.53	79.4	116.2	88.53
Low (in dollars per share)	87.92	91.57	94.76	77.2	76.14	76.8	77.44	65.52	77.2	65.52
Cash dividends declared (in dollars per share)	$ 0.57	$ 0.57	$ 0.57	$ 0.57	$ 0.51	$ 0.51	$ 0.51	$ 0.51	$ 2.28	$ 2.04	$ 1.84