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Consolidating Financial Information - Convertible Senior Subordinated Notes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Consolidating Financial Information [Line Items] |  |  |
Coupon rate | 5.875% |  |
Cash acquired from acquisition | $ 18.7 | $ 73.5 | $ 15.8
Convertible Senior Subordinated Notes | April 2013 Notes |  |  |
Consolidating Financial Information [Line Items] |  |  |
Coupon rate | 1.25% |  |
Lions Gate Entertainment Inc [Member] | Lions Gate Entertainment Inc. |  |  |
Consolidating Financial Information [Line Items] |  |  |
Percentage ownership of LGEI, the issuer, by the parent company guarantor | 100.00% |  |

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