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Noncontrolling Interests - Narrative (Details) - USD ($) $ in Millions |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2024 | Jan. 02, 2024 | Feb. 28, 2023 | Apr. 02, 2021 | May 29, 2018 | Jul. 31, 2024 | Mar. 31, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022 | Jan. 31, 2027 | Jun. 05, 2024 | Nov. 14, 2022 | Nov. 12, 2015
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental compensation expense |  |  |  |  |  |  |  |  |  | $ 49.2 |  |  |  |  |  |
Purchase of noncontrolling interest | $ 194.1 |  |  |  |  |  |  | $ 7.4 | $ 0.6 | 194.6 | $ 36.5 | $ 0.0 |  |  |  |
Noncontrolling interests |  |  |  |  |  |  | $ 2.2 | 34.9 |  | 2.2 | 1.5 |  |  |  |  |
Decrease from redemptions |  |  |  |  |  |  |  | 23.4 | $ 0.6 | 194.6 | 55.1 | $ 0.0 |  |  |  |
Accumulated deficit |  |  |  |  |  |  | $ (1,249.1) | (1,451.8) |  | (1,249.1) | $ (881.9) |  |  |  |  |
3 Arts Entertainment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in ownership percentage | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary equity, other changes |  |  |  |  |  |  |  | $ 93.2 |  | $ 93.2 |  |  |  |  |  |
3 Arts Entertainment | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling owner's right to purchase remaining ownership interest of parent (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 24.00% |  |  |
CP LG Library Holdings, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interest, ownership (as Percent) |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 33.6 |  |
Pilgrim Media Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of noncontrolling interest |  |  |  |  |  | $ 13.5 |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  | 12.50% |  |  |  |  |  |  |  |  |  |
Decrease from redemptions |  |  |  |  |  | $ 23.4 |  |  |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  | $ 9.9 |  |  |  |  |  |  |  |  |  |
Three Arts Entertainment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of redeemable non controlling interest ownership percentage |  | 25.00% |  |  |  |  | 25.00% |  |  | 25.00% | 49.00% |  |  |  |  | 37.50%
Recoupable non controlling interest value |  |  |  |  | $ 38.3 |  |  |  |  |  |  |  |  |  |  |
Period of recoupable non controlling interest |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Deferred compensation |  |  |  |  | $ 38.3 |  |  |  |  |  |  |  |  |  |  |
Amortized period of deferred compensation |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Business Combination |  | $ 194.1 |  |  |  |  |  |  |  | $ 194.1 |  |  |  |  |  |
Percentage of Right to Acquire Non-Cotrolling Interest |  | 24.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental compensation expense |  |  |  |  |  |  | $ 49.2 |  |  | 49.2 |  |  |  |  |  |
Three Arts Entertainment | Other Noncurrent Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensatory portion of non controlling interest |  |  |  |  |  |  | $ 93.2 |  |  | $ 93.2 |  |  |  |  |  |
Pilgrim Media Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non compensatory non controlling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 90.1
Percentage of redeemable non controlling interest ownership percentage |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  | 25.00% |
Exercisable fair value period of redeemable non controlling interest |  |  |  | 30 days |  |  |  |  |  |  |  |  |  |  |  |
Payment on exercised of non controlling interest |  |  | $ 36.5 |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of non controlling interest |  |  | 55.1 |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in parent net investment |  |  | $ 18.6 |  |  |  |  |  |  |  |  |  |  |  |  |

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