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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, 2016
Mar. 31, 2015
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 1,461,521 901,611
Vested (in shares)     (1,789,908) (1,438,207) (1,360,524)
Forfeited (in shares)     (164,592) (37,910) (18,234)
Outstanding (in shares) 0   1,230,564 1,647,432 1,662,028
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 $ 29.55
Vested, Weighted Average Grant Date Fair Value (in usd per share)     25.01 28.22 22.05
Forfeited, Weighted Average Grant Date Fair Value (in usd per share)     30.18 30.36 19.41
Outstanding, Weighted Average Grant Date Fair Value (in usd per share)     $ 28.18 $ 31.74 $ 28.10
Activity After Share Reclassification And Starz Merger | Restricted Share Units (RSUs) | Class A Voting 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 and Class B common stock upon reclassification of common stock (in shares) 615,103        
Issuance for Lions Gate replacement awards (in shares)   0      
Granted (in shares)   15,529      
Vested (in shares)   (105,796)      
Forfeited (in shares)   (5,688)      
Outstanding (in shares)   519,148      
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      
Vested, Weighted Average Grant Date Fair Value (in usd per share)   29.55      
Forfeited, Weighted Average Grant Date Fair Value (in usd per share)   30.91      
Outstanding, Weighted Average Grant Date Fair Value (in usd per share)   $ 27.85      
Activity After Share Reclassification And Starz Merger | Restricted Share Units (RSUs) | Class B Non-Voting 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 and Class B common stock upon reclassification of common stock (in shares) 615,103        
Issuance for Lions Gate replacement awards (in shares)   0      
Granted (in shares)   410,857      
Vested (in shares)   (109,201)      
Forfeited (in shares)   (5,688)      
Outstanding (in shares)   911,071      
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      
Vested, Weighted Average Grant Date Fair Value (in usd per share)   29.41      
Forfeited, Weighted Average Grant Date Fair Value (in usd per share)   30.91      
Outstanding, Weighted Average Grant Date Fair Value (in usd per share)   $ 26.62      
Activity After Share Reclassification And Starz Merger | Restricted Stock | Class B Non-Voting 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 and Class B common stock upon reclassification of common stock (in shares) 0        
Issuance for Lions Gate replacement awards (in shares)   1,861,342      
Granted (in shares)   0      
Vested (in shares)   (373,148)      
Forfeited (in shares)   (141,259)      
Outstanding (in shares)   1,346,935      
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      
Vested, Weighted Average Grant Date Fair Value (in usd per share)   25.70      
Forfeited, Weighted Average Grant Date Fair Value (in usd per share)   25.70      
Outstanding, Weighted Average Grant Date Fair Value (in usd per share)   $ 25.70