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Capital Stock (Narrative - Equity) (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 08, 2016
USD ($)
installment
shares
Mar. 31, 2019
USD ($)
$ / shares
shares
Mar. 31, 2018
USD ($)
$ / shares
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
Common shares, no par value | $ / shares   $ 0 $ 0
Affiliation agreement, annual installment payment, equity or cash, amount | $   $ 8,300 $ 8,300
Affiliation Agreement, Annual Installment Payment, Shares Issued   400,000 300,000
Class B Non-Voting Common Shares      
Class of Stock [Line Items]      
Authorized common shares (in shares)   500,000,000 500,000,000
Common shares, no par value | $ / shares   $ 0 $ 0
Affiliation agreement, annual installment payment, equity or cash, amount | $   $ 8,300 $ 8,300
Affiliation Agreement, Annual Installment Payment, Shares Issued   500,000 300,000
Starz | Class A Voting Common Shares      
Class of Stock [Line Items]      
Issuance of common shares related to acquisitions and other, shares 74,200,000    
Starz | Class B Non-Voting Common Shares      
Class of Stock [Line Items]      
Issuance of common shares related to acquisitions and other, shares 74,200,000    
Common Shares | Starz | Class A Voting Common Shares      
Class of Stock [Line Items]      
Conversion of stock, shares issued (in shares) 0.5    
Common Shares | Starz | Class B Non-Voting Common Shares      
Class of Stock [Line Items]      
Conversion of stock, shares issued (in shares) 0.5