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Consolidating Financial Information - Convertible Senior Subordinated Notes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Senior Secured Second-Priority Notes | 5.25% Senior Notes |  |
Consolidating Financial Information [Line Items] |  |
Coupon rate | 5.25% |
Convertible Senior Subordinated Notes | January 2012 Notes |  |
Consolidating Financial Information [Line Items] |  |
Coupon rate | 4.00% |
Convertible Senior Subordinated Notes | April 2013 Notes |  |
Consolidating Financial Information [Line Items] |  |
Coupon rate | 1.25% |
Lions Gate Entertainment Inc. |  |
Consolidating Financial Information [Line Items] |  |
Percentage ownership of LGEI, the issuer, by the parent company guarantor | 100.00% |
Starz |  |
Consolidating Financial Information [Line Items] |  |
Cash acquired from acquisition | $ 73.5 |
Pilgrim Media Group |  |
Consolidating Financial Information [Line Items] |  |
Cash acquired from acquisition |  | $ 15.8

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