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Capital Stock (Common Shares Reserved for Future Issuance) (Details) - $ / shares shares in Millions	Sep. 30, 2017	Mar. 31, 2017
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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Aggregate number of common shares reserved for future issuance.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
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-Section 50
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 718
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-Section 50
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