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Capital Stock (Narrative) (Details) $ in Thousands |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Dec. 08, 2016 USD ($) installment shares | Oct. 03, 2016 shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) | Mar. 31, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Authorized common shares (in shares) |  |  |  |  | 500,000,000
Excess tax benefits on equity-based compensation awards | $ |  |  | $ 0 | $ 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 | $ |  |  | $ 72,000 |  |
Total unrecognized compensation cost, weighted average period for recognition |  |  | 2 years 7 months 9 days |  |
Restricted Share Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total unrecognized compensation cost | $ |  |  | $ 44,000 |  |
Total unrecognized compensation cost, weighted average period for recognition |  |  | 2 years 2 months 13 days |  |
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) |  | 31,600,000 |  |  |
Increase in authorized common shares (in shares) |  | 4,000,000 |  |  |
Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Reclassification of common shares, shares |  |  | (148,423,620) |  |
Class A Voting Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Authorized common shares (in shares) |  |  | 500,000,000 |  | 0
Class A Voting Shares | Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Reclassification of common shares, shares |  |  | 74,212,042 |  |
Class B Non-Voting Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Authorized common shares (in shares) |  |  | 500,000,000 |  | 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) |  |  | 30,300,000 |  |
Class B Non-Voting Shares | Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Reclassification of common shares, shares |  |  | 74,212,042 |  |
Starz | Class A Voting Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Reclassification of common shares, shares | 74,200,000 |  |  |  |
Starz | Class A Voting Shares | Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Conversion of Stock, Shares Issued | 0.5 |  |  |  |
Starz | Class B Non-Voting Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Reclassification of common shares, shares | 74,200,000 |  |  |  |
Starz | Class B Non-Voting Shares | Common Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Conversion of Stock, Shares Issued | 0.5 |  |  |  |
Starz Dissenting Shareholders | Starz |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Purchase price, common shares issued or issuable (in shares) | 17,000,000 |  |  |  |
Outstanding equity interests (in shares) |  |  | 25,000,000 |  |

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