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Capital Stock (Common Shares Reserved for Future Issuance) (Details) - $ / shares shares in Millions | Sep. 30, 2017 | Mar. 31, 2017
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Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 47.2 | 50.0
Stock Options |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 31.8 | 32.6
Restricted Stock and Restricted Share Units - Unvested |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 2.4 | 2.7
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% |
Convertible Senior Subordinated Notes | April 2013 Notes |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Shares reserved for future issuance (in shares) | 2.1 | 2.1
Conversion price per share (in usd per share) | $ 29.19 | $ 29.19
April 2013 Notes | Convertible Senior Subordinated Notes |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
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) | 10.9 | 0.8
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) | 0.0 | 11.8
Class A Voting Shares | Stock Options |  |
Common Shares Reserved For Future Issuance [Line Items] |  |
Stock options outstanding, average exercise price (in usd per share) | $ 26.84 | $ 26.67
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) | $ 19.76 | $ 19.43

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