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Capital Stock (Narrative - Equity) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 08, 2016
USD ($)
installment
shares
Mar. 31, 2018
USD ($)
shares
Mar. 31, 2018
shares
Mar. 31, 2017
shares
Class of Stock [Line Items]        
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      
Class A Voting Common Shares        
Class of Stock [Line Items]        
Authorized common shares (in shares)   500,000,000 500,000,000 500,000,000
Affiliation agreement, annual installment payment, equity or cash, amount | $   $ 8,300    
Affiliation Agreement, Annual Installment Payment, Shares Issued   266,667    
Class B Non-Voting Common Shares        
Class of Stock [Line Items]        
Authorized common shares (in shares)   500,000,000 500,000,000 500,000,000
Affiliation agreement, annual installment payment, equity or cash, amount | $   $ 8,300    
Affiliation Agreement, Annual Installment Payment, Shares Issued   278,334    
Starz | Class A Voting Common Shares        
Class of Stock [Line Items]        
Reclassification of common shares, shares 74,200,000      
Starz | Class B Non-Voting Common Shares        
Class of Stock [Line Items]        
Reclassification of common shares, shares 74,200,000      
Common Shares | Starz | Class A Voting Common Shares        
Class of Stock [Line Items]        
Conversion of Stock, Shares Issued 0.5      
Common Shares | Starz | Class B Non-Voting Common Shares        
Class of Stock [Line Items]        
Conversion of Stock, Shares Issued 0.5      
Starz Dissenting Shareholders | Starz        
Class of Stock [Line Items]        
Outstanding equity interests (in shares) 25,000,000 22,500,000 22,500,000  
Starz Dissenting Shareholders | Starz | Class B Non-Voting Common Shares        
Class of Stock [Line Items]        
Purchase price, common shares issued or issuable (in shares)     15,300,000