Investment in Films and Television Programs and Licensed Program Rights - Impairments (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Write downs on investments in films and television programs	$ 33.6	$ 55.8	$ 10.8
Content impairment	7.7
Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Write downs on investments in films and television programs	169.8	420.3	390.1
Development costs, write off		12.8
Not included in segment operating results
Segment Reporting Information [Line Items]
Write downs on investments in films and television programs	7.2	12.8	0.0
Not included in segment operating results \| Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Write downs on investments in films and television programs	143.4	377.3	379.3
Motion Picture \| Reportable Segments
Segment Reporting Information [Line Items]
Write downs on investments in films and television programs	19.7	34.6	6.2
Motion Picture \| Reportable Segments \| Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Write downs on investments in films and television programs	19.7	34.6	6.2
Television Production \| Reportable Segments
Segment Reporting Information [Line Items]
Write downs on investments in films and television programs	6.7	8.4	4.6
Television Production \| Reportable Segments \| Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Write downs on investments in films and television programs	6.7	$ 8.4	$ 4.6
Motion Picture And Television Production \| Lions Gate Entertainment Corp.
Segment Reporting Information [Line Items]
Content impairment	$ 7.7

Development Costs, Write Off

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

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- Definition

Amount of impairment loss on capitalized cost for film predominantly monetized on its own and film group.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 926
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4C
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483154/926-20-50-4C

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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