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Capital Stock (Common Shares Reserved for Future Issuance) (Details) - $ / shares
shares in Millions
Dec. 31, 2016
Mar. 31, 2016
Common Shares Reserved For Future Issuance [Line Items]    
Shares reserved for future issuance (in shares) 58 25
Stock Options    
Common Shares Reserved For Future Issuance [Line Items]    
Shares reserved for future issuance (in shares) 36 15
Stock options outstanding, average exercise price (in usd per share)   $ 24.55
Restricted Stock and Restricted Share Units - Unvested    
Common Shares Reserved For Future Issuance [Line Items]    
Shares reserved for future issuance (in shares) 3 2
Convertible Senior Subordinated Notes | January 2012 Notes    
Common Shares Reserved For Future Issuance [Line Items]    
Shares reserved for future issuance (in shares) 4 4
Conversion price per share (in usd per share) $ 10.21 $ 10.26
Convertible Senior Subordinated Notes | April 2013 Notes    
Common Shares Reserved For Future Issuance [Line Items]    
Shares reserved for future issuance (in shares) 2 2
Conversion price per share (in usd per share) $ 29.19 $ 29.32
January 2012 Notes | Convertible Senior Subordinated Notes    
Common Shares Reserved For Future Issuance [Line Items]    
Conversion price per share (in usd per share) $ 10.21  
Coupon rate 4.00%  
April 2013 Notes | Convertible Senior Subordinated Notes    
Common Shares Reserved For Future Issuance [Line Items]    
Conversion price per share (in usd per share) $ 29.19  
Coupon rate 1.25%  
Lionsgate Plan | Common shares available for future issuance under plan    
Common Shares Reserved For Future Issuance [Line Items]    
Shares reserved for future issuance (in shares) 1 2
Starz Plan | Common shares available for future issuance under plan    
Common Shares Reserved For Future Issuance [Line Items]    
Shares reserved for future issuance (in shares) 12 0
Class A Voting Shares | Stock Options    
Common Shares Reserved For Future Issuance [Line Items]    
Stock options outstanding, average exercise price (in usd per share) $ 25.93  
Class B Non-Voting Shares | Stock Options    
Common Shares Reserved For Future Issuance [Line Items]    
Stock options outstanding, average exercise price (in usd per share) $ 18.82