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Capital Stock (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Dec. 08, 2016
USD ($)
installment
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Sep. 12, 2017
shares
Mar. 31, 2017
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Excess tax benefits recognized associated with equity awards | $     $ 2,300 $ 0    
Number of annual installments | installment 3          
Annual installment payment, equity or cash, amount | $ $ 16,670          
Value of agreement | $ $ 50,000          
2012 Plan and Starz 2016 Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of common shares available for grant under the share-based compensation arrangement plan (in shares)         12,973,816  
Prior Plans            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of common shares authorized under the share-based compensation arrangement plan (in shares)         34,790,628  
Class A Voting Shares            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Authorized common shares (in shares)   500,000,000 500,000,000     500,000,000
Annual installment payment, equity or cash, amount | $   $ 8,300        
Affiliation agreement, annual installment payment, shares issued   266,667        
Class B Non-Voting Shares            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Authorized common shares (in shares)   500,000,000 500,000,000     500,000,000
Annual installment payment, equity or cash, amount | $   $ 8,300        
Affiliation agreement, annual installment payment, shares issued   278,334