Segment Reporting, Revenue by Products (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 25, 2016	Sep. 25, 2016	Jun. 26, 2016	Mar. 27, 2016	Dec. 27, 2015	Sep. 27, 2015	Jun. 28, 2015	Mar. 29, 2015	Dec. 25, 2016	Dec. 27, 2015	Dec. 28, 2014
Revenue from External Customer [Line Items]
Net revenues	$ 1,629,940	$ 1,679,757	$ 878,945	$ 831,180	$ 1,465,354	$ 1,470,997	$ 797,658	$ 713,500	$ 5,019,822	$ 4,447,509	$ 4,277,207
Boys [Member]
Revenue from External Customer [Line Items]
Net revenues									1,849,645	1,775,917	1,483,952
Games [Member]
Revenue from External Customer [Line Items]
Net revenues									1,387,077	1,276,532	1,259,782
Girls [Member]
Revenue from External Customer [Line Items]
Net revenues									1,193,877	798,240	1,022,633
Preschool [Member]
Revenue from External Customer [Line Items]
Net revenues									$ 589,223	$ 596,820	$ 510,840