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Capital Stock (Common Shares Reserved for Future Issuance) (Details) - $ / shares shares in Millions | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | ---
Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 58 | 25
Stock Options |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 36 | 15
Stock options outstanding, average exercise price (in usd per share) |  | $ 24.55
Restricted Stock and Restricted Share Units - Unvested |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 3 | 2
Convertible Senior Subordinated Notes | January 2012 Notes |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 4 | 4
Conversion price per share (in usd per share) | $ 10.21 | $ 10.26
Convertible Senior Subordinated Notes | April 2013 Notes |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 2 | 2
Conversion price per share (in usd per share) | $ 29.19 | $ 29.32
January 2012 Notes | Convertible Senior Subordinated Notes |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Conversion price per share (in usd per share) | $ 10.21 |
Coupon rate | 4.00% |
April 2013 Notes | Convertible Senior Subordinated Notes |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Conversion price per share (in usd per share) | $ 29.19 |
Coupon rate | 1.25% |
Lionsgate Plan | Common shares available for future issuance under plan |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 1 | 2
Starz Plan | Common shares available for future issuance under plan |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 12 | 0
Class A Voting Shares | Stock Options |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Stock options outstanding, average exercise price (in usd per share) | $ 25.93 |
Class B Non-Voting Shares | Stock Options |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Stock options outstanding, average exercise price (in usd per share) | $ 18.82 |

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