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Goodwill and Intangible Assets - Summary of Goodwill (Parenthetical) (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
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Sep. 30, 2024 | Mar. 31, 2024
Goodwill purchase accounting period adjustments | $ 4.7 | $ 9.8
Net Decrease To Accounts Receivables |  |
Goodwill purchase accounting period adjustments |  | 11.4
Net Decreases To Other Assets |  |
Goodwill purchase accounting period adjustments |  | 12.4
Net Increase To Investment In Films And Television Programs |  |
Goodwill purchase accounting period adjustments |  | 4.0
Net Decreases To Content Related Payables |  |
Goodwill purchase accounting period adjustments |  | 1.9
Net Decreases To Accrued Liabilities |  |
Goodwill purchase accounting period adjustments |  | 3.8
Net Decreases To Participations And Residuals |  |
Goodwill purchase accounting period adjustments |  | 1.9
Net Decreases To Deferred Revenue |  |
Goodwill purchase accounting period adjustments |  | $ 2.4

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- Definition Amount of increase (decrease) from measurement period adjustment of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482573/350-20-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 25 -Paragraph 16 -SubTopic 10 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479405/805-10-25-16 + Details
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