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Acquisitions and Dispositions (Narrative) (Details)
$ in Millions
Jul. 15, 2021
USD ($)
title
Jul. 31, 2023
USD ($)
Jul. 31, 2022
USD ($)
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