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Capital Stock (Narrative - Share Based Compensation) (Details) - USD ($)
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Sep. 12, 2017
Dec. 08, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Excess tax benefits on equity-based compensation awards $ 5,200,000 $ 0 $ 0    
2012 Plan and Starz 2016 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of 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 shares authorized for compensation plans (in shares)       34,790,628  
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercised, total intrinsic value $ 36,900,000 $ 30,000,000 $ 15,600,000    
Shares cancelled to fund withholding tax obligations on option exercises (in shares) 112,162 819,503 93,210    
Restricted Share Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares withheld for tax purposes upon vesting of restricted share units (in shares) 674,673 1,006,888 636,136    
Stock Compensation Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Other share-based compensation granted in period, fair value $ 800,000 $ 1,100,000 $ 1,300,000    
Shares issued, net of shares for tax withholdings (in shares) 16,231 28,257 19,578    
Class B Non-Voting Common Shares | Starz Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares authorized for compensation plans (in shares)         30,300,000