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Capital Stock (Narrative - Equity) (Details)
$ in Thousands
 12 Months Ended 120 Months Ended
Dec. 08, 2016
USD ($)
installment
shares
Mar. 31, 2017
USD ($)
shares
Mar. 31, 2016
USD ($)
shares
Mar. 31, 2015
USD ($)
shares
May 25, 2017
USD ($)
Feb. 02, 2016
USD ($)
Feb. 01, 2016
USD ($)
Class of Stock [Line Items]              
Authorized common shares (in shares)   500,000,000 500,000,000        
Share repurchase plan, authorized amount | $           $ 468,000 $ 300,000
Shares Repurchased (in shares)   0 3,600,395 5,026,512      
Repurchase of common shares, no par value | $   $ 0 $ 73,200 $ 136,500      
Affiliation agreement, number of annual installments | installment 3            
Affiliation agreement, annual installment payment, equity or cash, amount | $ $ 16,670            
Affiliation agreement, value of agreement | $ $ 50,000            
Subsequent Event              
Class of Stock [Line Items]              
Repurchase of common shares, no par value | $         $ 283,200    
Share repurchase plan, remaining capacity | $         $ 184,700    
Class A Voting Shares              
Class of Stock [Line Items]              
Authorized common shares (in shares)   500,000,000 0        
Class B Non-Voting Shares              
Class of Stock [Line Items]              
Authorized common shares (in shares)   500,000,000 0        
Starz | Class A Voting Shares              
Class of Stock [Line Items]              
Reclassification of common shares, shares 74,200,000            
Starz | Class B Non-Voting Shares              
Class of Stock [Line Items]              
Reclassification of common shares, shares 74,200,000            
Common Shares | Starz | Class A Voting Shares              
Class of Stock [Line Items]              
Conversion of Stock, Shares Issued 0.5            
Common Shares | Starz | Class B Non-Voting Shares              
Class of Stock [Line Items]              
Conversion of Stock, Shares Issued 0.5            
Starz Dissenting Shareholders | Starz              
Class of Stock [Line Items]              
Purchase price, common shares issued or issuable (in shares) 15,300,000            
Outstanding equity interests (in shares) 25,000,000 22,500,000