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Consolidating Financial Information - Convertible Senior Subordinated Notes (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	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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+ References

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- Definition

The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
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Contractual interest rate for funds borrowed, under the debt agreement.

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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
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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