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Capital Stock (Stock Options Activity After Dec 8, 2016) (Details) - Stock Options - USD ($)
4 Months Ended 8 Months Ended 12 Months Ended
Dec. 08, 2016
Mar. 31, 2017
Dec. 07, 2016
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]            
Exercised (in shares)     (2,145,852)   (640,008) (609,160)
Forfeited or expired (in shares)     (552,067)   (19,138) (35,963)
Outstanding, end of period (in shares) 0   19,393,516   16,093,896 13,214,696
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]            
Granted, Weighted Average Exercise Price (in usd per share)     $ 22.73   $ 31.50 $ 29.49
Exercised, Weighted Average Exercise Price (in usd per share)     9.78   13.01 14.39
Forfeited or expired, Weighted Average Exercise Price (in usd per share)     32.39   26.54 17.69
Outstanding, Weighted Average Exercise Price (in usd per share)     $ 24.80   $ 23.83 $ 21.26
Activity After Share Reclassification And Starz Merger | Class A Voting Shares            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]            
Issuance of Class A and Class B common stock upon reclassification of common stock (in shares) 9,528,634          
Issuance for Lions Gate replacement awards (in shares)   0        
Granted (in shares)   36,645        
Exercised (in shares)   (447,140)        
Forfeited or expired (in shares)   (28,224)        
Outstanding, end of period (in shares)   9,089,915   9,089,915    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]            
Issuance of Class A and Class B common stock upon reclassification of common stock, weighted average exercise price (in usd per share) $ 25.53          
Issuance for Lions Gate replacement awards (in usd per share)   $ 0.00        
Granted, Weighted Average Exercise Price (in usd per share)   26.03        
Exercised, Weighted Average Exercise Price (in usd per share)   10.25        
Forfeited or expired, Weighted Average Exercise Price (in usd per share)   33.65        
Outstanding, Weighted Average Exercise Price (in usd per share)   $ 26.67   $ 26.67    
Outstanding, Weighted Average Remaining Contractual Term In Years       7 years 1 month 17 days    
Outstanding, Aggregate Intrinsic Value   $ 26,882,498   $ 26,882,498    
Outstanding, vested or expected to vest in the future (in shares)   9,041,899   9,041,899    
Outstanding, vested or expected to vest in the future, Weighted Average Exercise Price (in usd per share)   $ 26.68   $ 26.68    
Outstanding, vested or expected to vest in the future, Weighted Average Remaining Contractual Term In Years       7 years 1 month 17 days    
Outstanding, vested or expected to vest in the future, Aggregate Intrinsic Value   $ 26,678,815   $ 26,678,815    
Exercisable (in shares)   4,591,258   4,591,258    
Exercisable, Weighted Average Exercise Price (in usd per share)   $ 26.58   $ 26.58    
Exercisable, Weighted Average Remaining Contractual Term In Years       5 years 8 months 9 days    
Exercisable, Aggregate Intrinsic Value   $ 15,861,328   $ 15,861,328    
Activity After Share Reclassification And Starz Merger | Class B Non-Voting Shares            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]            
Issuance of Class A and Class B common stock upon reclassification of common stock (in shares) 9,528,634          
Issuance for Lions Gate replacement awards (in shares)   15,395,707        
Granted (in shares)   946,671        
Exercised (in shares)   (2,198,914)        
Forfeited or expired (in shares)   (207,169)        
Outstanding, end of period (in shares)   23,464,929   23,464,929    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]            
Issuance of Class A and Class B common stock upon reclassification of common stock, weighted average exercise price (in usd per share) $ 24.68          
Issuance for Lions Gate replacement awards (in usd per share)   $ 14.68        
Granted, Weighted Average Exercise Price (in usd per share)   25.06        
Exercised, Weighted Average Exercise Price (in usd per share)   12.43        
Forfeited or expired, Weighted Average Exercise Price (in usd per share)   25.52        
Outstanding, Weighted Average Exercise Price (in usd per share)   $ 19.43   $ 19.43    
Outstanding, Weighted Average Remaining Contractual Term In Years       6 years 9 months 7 days    
Outstanding, Aggregate Intrinsic Value   $ 190,383,695   $ 190,383,695    
Outstanding, vested or expected to vest in the future (in shares)   23,200,380   23,200,380    
Outstanding, vested or expected to vest in the future, Weighted Average Exercise Price (in usd per share)   $ 19.38   $ 19.38    
Outstanding, vested or expected to vest in the future, Weighted Average Remaining Contractual Term In Years       6 years 8 months 27 days    
Outstanding, vested or expected to vest in the future, Aggregate Intrinsic Value   $ 189,651,262   $ 189,651,262    
Exercisable (in shares)   16,058,080   16,058,080    
Exercisable, Weighted Average Exercise Price (in usd per share)   $ 16.71   $ 16.71    
Exercisable, Weighted Average Remaining Contractual Term In Years       5 years 1 month 6 days    
Exercisable, Aggregate Intrinsic Value   $ 171,087,638   $ 171,087,638