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Capital Stock (Shares Reserved for Future Issuance) (Details) - $ / shares shares in Millions	Mar. 31, 2017	Mar. 31, 2016
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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Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870

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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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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