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Consolidating Financial Information - Convertible Senior Subordinated Notes (Narrative) (Details) - USD ($) $ in Millions | 9 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Consolidating Financial Information [Line Items] |  |
Cash acquired from business acquisitions | $ 18.7 | $ 73.5
Convertible Senior Subordinated Notes |  |
Consolidating Financial Information [Line Items] |  |
Coupon rate | 1.25% |
April 2013 Notes | Convertible Senior Subordinated Notes |  |
Consolidating Financial Information [Line Items] |  |
Coupon rate | 1.25% |
Lions Gate Entertainment Inc. | Lions Gate Entertainment Inc. |  |
Consolidating Financial Information [Line Items] |  |
Percentage ownership of LGEI, the issuer, by parent company guarantor | 100.00% |

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