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Acquisitions - Narrative (Details) $ in Millions |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 05, 2024 USD ($) Film | Dec. 27, 2023 USD ($) | Jun. 26, 2023 USD ($) | Jul. 31, 2022 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Purchase of feature film titles |  |  |  |  |  |  |  |  |  | 200 |  |
Film cost |  |  |  |  |  |  |  |  |  | $ 191.4 |  |
Film, monetized in film group, amortization expense |  |  | $ 10.0 | $ 10.0 |  |  |  |  | $ 1,347.8 | 1,649.3 | $ 1,497.5 | $ 171.4
Aggregate cash price |  | $ 385.1 |  |  |  |  |  |  |  |  |  |
Acquisition related costs |  |  |  |  |  |  |  |  | $ 9.4 |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  | 5 years |  |  |
Loss before income taxes |  |  |  |  | $ (108.9) | $ 17.4 | $ (148.2) | $ 2.6 | $ (72.7) | 5.4 | 11.2 |
Revenue |  |  |  |  |  |  |  |  | 2,986.4 | 3,083.8 | $ 2,716.3 |
Number of films acquired | Film | 46 |  |  |  |  |  |  |  |  |  |  |
Variable interest entity, initial consolidation, gain (loss) | $ 0.0 |  |  |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  | 5,261.4 |  | 5,261.4 |  | 5,103.0 | 4,412.7 |  |
Liabilities |  |  |  |  | 6,200.3 |  | 6,200.3 |  | 6,129.9 | $ 4,848.0 |  |
CP LG Library Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset acquisition, consideration transferred | 68.6 |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  |  |  |  | 85.1 |  | 85.1 |  |  |  |  |
Liabilities |  |  |  |  | 16.6 |  | 16.6 |  |  |  |  |
Film and Television Library | CP LG Library Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Asset acquisition, consideration transferred | 48.3 |  |  |  |  |  |  |  |  |  |  |
eOne |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  | $ 385.1 |  |  | $ 373.1 |  | $ 373.1 |  |  |  |  |
Pro forma impairment of goodwill and trade name at eOne |  |  |  |  |  |  |  | $ 296.2 |  |  |  |
eOne | Trade Names |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life (in years) |  | 5 years |  |  |  |  |  |  |  |  |  |
CP LG Library Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred | $ 35.0 |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired | 51.00% |  |  |  |  |  |  |  |  |  |  |
CP LG Library Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners | 49.00% |  |  |  |  |  |  |  |  |  |  |
E One |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss before income taxes |  |  |  |  |  |  |  |  | 113.8 |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 4.9 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  | 5 years |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  | 5 years |  |  |
Minimum | eOne | Film and Television Library |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life (in years) |  | 5 years |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  |  | 10 years |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  |  | 15 years |  |  |
Maximum | eOne | Film and Television Library |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life (in years) |  | 10 years |  |  |  |  |  |  |  |  |  |

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