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Acquisitions and Dispositions (Narrative) (Details) $ in Millions | Jul. 15, 2021 USD ($) title | Jul. 31, 2023 USD ($) | Jul. 31, 2022 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 |  |
Asset acquisition and preferred equity interest, deferred purchase consideration paid or payable |  |  | $ 10.0
Spyglass | Spyglass Library | Forecast |  |  |
Asset Acquisition [Line Items] |  |  |
Asset acquisition and preferred equity interest, deferred purchase consideration paid or payable |  | $ 10.0 |

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