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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 |  |  |

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