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Capital Stock (Shares Reserved for Future Issuance) (Details) - $ / shares shares in Millions | Mar. 31, 2017 | Mar. 31, 2016
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 50.0 | 25.2
Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 32.6 | 15.3
Stock options outstanding, average exercise price (in usd per share) |  | $ 24.55
Restricted Share Units (RSUs) |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 2.7 | 1.6
January 2012 Notes |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Conversion price per share (in usd per share) |  | $ 10.26
Coupon rate | 4.00% |
April 2013 Notes |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Conversion price per share (in usd per share) | $ 29.19 | $ 29.32
Coupon rate | 1.25% |
Lionsgate Plan | Common shares available for future issuance under plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 0.8 | 2.1
Starz Plan | Common shares available for future issuance under plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 11.8 | 0.0
Convertible Senior Subordinated Notes | January 2012 Notes |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 0.0 | 4.1
Convertible Senior Subordinated Notes | April 2013 Notes |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Shares reserved for future issuance (in shares) | 2.1 | 2.1
Class A Voting Shares | Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock options outstanding, average exercise price (in usd per share) | $ 26.67 |
Class B Non-Voting Shares | Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Stock options outstanding, average exercise price (in usd per share) | $ 19.43 |

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