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Acquisition (Details) - USD ($)
shares in Thousands, $ in Thousands
 7 Months Ended 12 Months Ended
Jul. 13, 2016
Dec. 30, 2018
Dec. 31, 2017
Dec. 25, 2016
Business Acquisition [Line Items]        
Goodwill   $ 485,881 $ 573,063 $ 570,555
Program production costs   $ (131,984) $ (48,003) $ (48,690)
Boulder Media [Member]        
Business Acquisition [Line Items]        
Date Of Acquisition Jul. 13, 2016      
Business Acquisition, Name Of Acquired Entity Boulder Media Limited      
Payments To Acquire Businesses, Gross $ 13,177      
Goodwill $ 11,821      
Power Rangers and other entertainment assets [Member]        
Business Acquisition [Line Items]        
Date Of Acquisition   Jun. 12, 2018    
Payments To Acquire Businesses, Gross   $ 152,000    
Transaction costs   1,973    
Cash in escrow supporting indemnification obligations   25,000    
Other payments to acquire business   22,250    
Total acquisition price per agreement   $ 535,850    
Business acquisition, Equity interests issued or issuable, Number of shares issued   3,074    
Purchase price remainder to be paid in subsequent period   $ 75,000    
Identifiable intangible assets recorded   534,370    
Business combination, consideration transferred before transaction costs and working capital adjustments   532,397    
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    
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