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Restructuring and Other - Restructuring and Other (Details) (Parenthetical) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Operating Lease, Impairment Loss |  |  |  |  |  |  | $ 12.8 |  |
Equipment Cost For Insurance Recoveries Amount |  |  |  |  |  |  | 1.0 | $ 8.4 | $ 15.6
Development costs written off |  |  |  |  |  |  | 5.8 |  |
Incremental compensation expense |  |  |  |  |  |  | 49.2 |  |
Insurance recoveries | $ 0.0 |  | $ 0.5 | $ 2.1 | $ 0.5 |  |  |  |
Three Arts Entertainment |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Incremental compensation expense |  | $ 49.2 |  |  |  |  | $ 49.2 |  |
Fifty One Percent Consolidated Entity |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Equity method investment ownership percentage |  | 51.00% |  |  |  |  | 51.00% |  |
Loss associated with theft |  |  |  |  |  | $ 16.6 |  |  |
Starz Business of Lions Gate Entertainment Corp |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Equipment Cost For Insurance Recoveries Amount |  |  |  | 1.1 |  |  | $ 0.2 | 5.6 | $ 6.5
Impairment charges incurred from inception of the plan till date |  |  |  | $ 295.7 |  |  | $ 300.6 |  |
Gain loss on legal settlement |  |  |  |  |  |  |  | $ 11.0 |

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