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Goodwill and Intangible Assets - Summary of Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Goodwill, balance at beginning of period |  | $ 795.6 | $ 795.6 |
Acquisition of eOne |  |  | 5.8 |
Measurement period adjustments |  |  | 9.8 |
Goodwill, balance at end of period | $ 806.5 |  | 811.2 | $ 795.6
Motion Picture |  |  |  |
Goodwill, balance at beginning of period |  | 393.7 | 393.7 |
Acquisition of eOne |  |  | 1.0 |
Measurement period adjustments |  |  | 3.9 |
Goodwill, balance at end of period |  |  | 398.6 | 393.7
Television Production |  |  |  |
Goodwill, balance at beginning of period |  | 401.9 | 401.9 |
Acquisition of eOne |  |  | 4.8 |
Measurement period adjustments |  |  | 5.9 |
Goodwill, balance at end of period |  |  | 412.6 | 401.9
Starz Business of Lions Gate Entertainment Corp |  |  |  |
Goodwill, balance at beginning of period |  | 494.0 | 494.0 | 1,755.7
Impairments |  | $ (494.0) | (494.0) | (1,475.0)
Goodwill, balance at end of period |  |  | $ 0.0 | 494.0
Starz Business of Lions Gate Entertainment Corp | Star Networks Reporting Units |  |  |  |
Impairments |  |  |  | $ (1,261.7)

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