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Capital Stock (Restricted Share Unit Activity After Dec 8, 2016) (Details) - $ / shares
4 Months Ended 8 Months Ended 12 Months Ended
Dec. 08, 2016
Mar. 31, 2017
Dec. 07, 2016
Mar. 31, 2018
Mar. 31, 2016
Restricted Share Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Granted (in shares)     1,537,632   1,461,521
Vested (in shares)     (1,789,908)   (1,438,207)
Forfeited (in shares)     (164,592)   (37,910)
Outstanding (in shares) 0   1,230,564   1,647,432
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]          
Granted, Weighted Average Grant Date Fair Value (in usd per share)     $ 20.89   $ 32.36
Vested, Weighted Average Grant Date Fair Value (in usd per share)     25.01   28.22
Forfeited, Weighted Average Grant Date Fair Value (in usd per share)     30.18   30.36
Outstanding, Weighted Average Grant Date Fair Value (in usd per share)     $ 28.18   $ 31.74
Restricted Share Units (RSUs) | Class A Voting Common Shares          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Outstanding (in shares)   519,148   230,561  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]          
Outstanding, Weighted Average Grant Date Fair Value (in usd per share)   $ 27.85   $ 28.49  
Restricted Share Units (RSUs) | Class B Non-Voting Common Shares          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Outstanding (in shares)   911,071   1,511,648  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]          
Outstanding, Weighted Average Grant Date Fair Value (in usd per share)   $ 26.62   $ 28.71  
Activity After Share Reclassification And Starz Merger | Restricted Share Units (RSUs) | Class A Voting Common Shares          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Issuance of Class A voting shares and Class B non-voting shares upon reclassification of common stock (in shares) 615,103        
Issuance for Lions Gate replacement awards (in shares)   0      
Granted (in shares)   15,529   117,295  
Vested (in shares)   (105,796)   (393,137)  
Forfeited (in shares)   (5,688)   (12,745)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]          
Issuance of Cass A and Class B common stock upon reclassification of common stock, weighted average grant date fair value (in usd per share) $ 26.48        
Issuance for Lions Gate replacement awards, weighted average grant date fair value (in usd per share)   $ 0.00      
Granted, Weighted Average Grant Date Fair Value (in usd per share)   26.78   $ 29.11  
Vested, Weighted Average Grant Date Fair Value (in usd per share)   29.55   27.79  
Forfeited, Weighted Average Grant Date Fair Value (in usd per share)   $ 30.91   $ 29.69  
Activity After Share Reclassification And Starz Merger | Restricted Share Units (RSUs) | Class B Non-Voting Common Shares          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Issuance of Class A voting shares and Class B non-voting shares upon reclassification of common stock (in shares) 615,103        
Issuance for Lions Gate replacement awards (in shares)   0      
Granted (in shares)   410,857   1,200,352  
Vested (in shares)   (109,201)   (575,659)  
Forfeited (in shares)   (5,688)   (24,116)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]          
Issuance of Cass A and Class B common stock upon reclassification of common stock, weighted average grant date fair value (in usd per share) $ 28.20        
Issuance for Lions Gate replacement awards, weighted average grant date fair value (in usd per share)   $ 0.00      
Granted, Weighted Average Grant Date Fair Value (in usd per share)   25.06   $ 29.44  
Vested, Weighted Average Grant Date Fair Value (in usd per share)   29.41   26.97  
Forfeited, Weighted Average Grant Date Fair Value (in usd per share)   $ 30.91   $ 28.06  
Activity After Share Reclassification And Starz Merger | Restricted Stock | Class B Non-Voting Common Shares          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Issuance of Class A voting shares and Class B non-voting shares upon reclassification of common stock (in shares) 0        
Issuance for Lions Gate replacement awards (in shares)   1,861,342      
Granted (in shares)   0   0  
Vested (in shares)   (373,148)   (587,733)  
Forfeited (in shares)   (141,259)   (269,801)  
Outstanding (in shares)   1,346,935   489,401  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]          
Issuance of Cass A and Class B common stock upon reclassification of common stock, weighted average grant date fair value (in usd per share) $ 0.00        
Issuance for Lions Gate replacement awards, weighted average grant date fair value (in usd per share)   $ 25.70      
Granted, Weighted Average Grant Date Fair Value (in usd per share)   0.00   $ 25.70  
Vested, Weighted Average Grant Date Fair Value (in usd per share)   25.70   25.70  
Forfeited, Weighted Average Grant Date Fair Value (in usd per share)   25.70   25.70  
Outstanding, Weighted Average Grant Date Fair Value (in usd per share)   $ 25.70   $ 25.70