Asset Acquisition (Details) - USD ($) shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017
Business Acquisition [Line Items]
Date of acquisition	Jun. 12, 2018
Program Production Costs	$ 95,724	$ 25,309
Power Rangers and other entertainment assets [Member]
Business Acquisition [Line Items]
Cash paid at closing	152,000
Transaction costs	1,973
Cash in escrow supporting indemnification obligations	25,000
Other payments to acquire business	22,250
Purchase price remainder to be paid in subsequent period	75,000
Total acquisition price per agreement	535,850
Identifiable intangible assets recorded	534,370
Other Assets Current	7,884
Program Production Costs	325
Other Liabilities Current	6,729
Business combination, recognized identifiable assets acquired and liabilities assumed, working capital adjustment	1,480
Business combination, consideration transferred before transaction costs and working capital adjustments	$ 532,397
Acquired intangible asset, amortization period	25 years
Power Rangers and other entertainment assets [Member] | Common stock [Member]
Business Acquisition [Line Items]
Value, Hasbro, Inc. common shares, issued to Saban Properties	$ 280,397
Business acquisition, Equity interests issued or issuable, Number of shares issued	3,074,190