Segment Information - Summary Of Reconciles Total Share Based Compensation Expense (Parentheticals) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Total share-based compensation expense	$ 32.5	$ 29.5	$ 62.5	$ 73.4	$ 70.2
LIONSGATE STUDIOS CORP.
Total share-based compensation expense			$ 15.0	$ 26.7	$ 19.6

Amount of noncash expense for share-based payment arrangement.

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

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration