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Capital Stock (Narrative) (Details)
$ in Thousands, shares in Millions
3 Months Ended
Dec. 08, 2016
USD ($)
installment
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2016
USD ($)
Mar. 31, 2017
shares
Oct. 03, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Tax deficiencies written off associated with equity awards | $   $ 400 $ 0    
Number of annual installments | installment 3        
Annual installment payment, equity or cash, amount | $ $ 16,670        
Value of agreement | $ $ 50,000        
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total unrecognized compensation cost | $   $ 66,400      
Total unrecognized compensation cost, weighted average period for recognition   2 years 7 months 6 days      
Restricted Stock and Restricted Share Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total unrecognized compensation cost | $   $ 36,400      
Total unrecognized compensation cost, weighted average period for recognition   1 year 9 months 18 days      
Share Appreciation Rights (SARs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares) | shares   0.3      
Performance Incentive Plan of 2012          
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) | shares         31.6
Class A Voting Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Authorized common shares (in shares) | shares   500.0   500.0  
Class B Non-Voting Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Authorized common shares (in shares) | shares   500.0   500.0  
Class B Non-Voting Shares | Starz 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) | shares   26.8