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Capital Stock (Narrative) (Details) $ in Thousands |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 08, 2016 USD ($) installment | Sep. 30, 2017 USD ($) shares | Sep. 30, 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 |  | $ 200 | $ 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 |  | $ 63,600 |  |  |
Total unrecognized compensation cost, weighted average period for recognition |  | 2 years 4 months 24 days |  |  |
Restricted Stock and Restricted Share Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total unrecognized compensation cost |  | $ 35,300 |  |  |
Total unrecognized compensation cost, weighted average period for recognition |  | 1 year 7 months 6 days |  |  |
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) | 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) | shares |  |  |  | 34,790,628 |
Class A Voting Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Authorized common shares (in shares) | shares |  | 500,000,000 |  |  | 500,000,000
Class B Non-Voting Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Authorized common shares (in shares) | shares |  | 500,000,000 |  |  | 500,000,000

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