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Acquisitions and Dispositions (Narrative) (Details) $ in Millions | Jul. 15, 2021 USD ($) title | Jul. 31, 2023 USD ($) | Jul. 31, 2022 USD ($) | Mar. 31, 2021 USD ($)
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Spyglass Library |  |  |  |
Asset Acquisition [Line Items] |  |  |  |
Number of titles acquired | title | 200 |  |  |
Spyglass |  |  |  |
Asset Acquisition [Line Items] |  |  |  |
Equity method investment, ownership percentage | 18.90% |  |  |
Spyglass | Spyglass Library |  |  |  |
Asset Acquisition [Line Items] |  |  |  |
Purchase price of asset acquisition and preferred equity interest | $ 191.4 |  |  |
Cash paid at closing for assets acquisition and preferred equity interest | $ 171.4 |  |  |
Spyglass | Spyglass Library | Forecast |  |  |  |
Asset Acquisition [Line Items] |  |  |  |
Asset acquisition and preferred equity interest, deferred purchase consideration payable |  | $ 10.0 |  |
Spyglass | Spyglass Library | Subsequent Event |  |  |  |
Asset Acquisition [Line Items] |  |  |  |
Asset acquisition and preferred equity interest, deferred purchase consideration payable |  |  | $ 10.0 |
Disposal Group, Not Discontinued Operations | Pantaya |  |  |  |
Asset Acquisition [Line Items] |  |  |  |
Equity interest sold |  |  |  | 75.00%
Cash consideration |  |  |  | $ 123.6

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