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Capital Stock (Narrative - Equity) (Details) $ in Thousands |  | 12 Months Ended | 120 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 08, 2016 USD ($) installment shares | Mar. 31, 2017 USD ($) shares | Mar. 31, 2016 USD ($) shares | Mar. 31, 2015 USD ($) shares | May 25, 2017 USD ($) | Feb. 02, 2016 USD ($) | Feb. 01, 2016 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |
Authorized common shares (in shares) |  | 500,000,000 | 500,000,000 |  |  |  |
Share repurchase plan, authorized amount | $ |  |  |  |  |  | $ 468,000 | $ 300,000
Shares Repurchased (in shares) |  | 0 | 3,600,395 | 5,026,512 |  |  |
Repurchase of common shares, no par value | $ |  | $ 0 | $ 73,200 | $ 136,500 |  |  |
Affiliation agreement, number of annual installments | installment | 3 |  |  |  |  |  |
Affiliation agreement, annual installment payment, equity or cash, amount | $ | $ 16,670 |  |  |  |  |  |
Affiliation agreement, value of agreement | $ | $ 50,000 |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Repurchase of common shares, no par value | $ |  |  |  |  | $ 283,200 |  |
Share repurchase plan, remaining capacity | $ |  |  |  |  | $ 184,700 |  |
Class A Voting Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Authorized common shares (in shares) |  | 500,000,000 | 0 |  |  |  |
Class B Non-Voting Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Authorized common shares (in shares) |  | 500,000,000 | 0 |  |  |  |
Starz | Class A Voting Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Reclassification of common shares, shares | 74,200,000 |  |  |  |  |  |
Starz | Class B Non-Voting Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Reclassification of common shares, shares | 74,200,000 |  |  |  |  |  |
Common Shares | Starz | Class A Voting Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Conversion of Stock, Shares Issued | 0.5 |  |  |  |  |  |
Common Shares | Starz | Class B Non-Voting Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Conversion of Stock, Shares Issued | 0.5 |  |  |  |  |  |
Starz Dissenting Shareholders | Starz |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Purchase price, common shares issued or issuable (in shares) | 15,300,000 |  |  |  |  |  |
Outstanding equity interests (in shares) | 25,000,000 | 22,500,000 |  |  |  |  |

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