Segment Reporting, Revenue by Brand Portfolio (Details) - USD ($) $ 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
Revenue from External Customer [Line Items]
Net revenues	$ 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
Franchise Brands [Member]
Revenue from External Customer [Line Items]
Net revenues									2,567,962	2,327,668	2,285,414
Partner Brands [Member]
Revenue from External Customer [Line Items]
Net revenues									1,271,597	1,412,770	1,101,305
Hasbro Gaming [Member]
Revenue from External Customer [Line Items]
Net revenues									893,019	813,433	662,319
Emerging Brands [Member]
Revenue from External Customer [Line Items]
Net revenues									$ 477,204	$ 465,951	$ 398,471