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Asset Write Down (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
May 31, 2021
USD ($)
fairs
$ / shares
May 31, 2020
USD ($)
$ / shares
May 31, 2019
USD ($)
Class of Stock [Line Items]      
Asset impairments and write downs $ 11.1 $ 40.6 $ 0.9
Impairment on right-of-use assets 7.0    
Impairment expense on other long-lived assets 1.5    
Impairment loss impact 11.1    
Author advances   1.6  
Prepublication costs   0.8  
Asset impairment expense 2.6    
Provision for losses on inventory $ 36.6 34.3 $ 20.8
Number of book fair closed | fairs 13    
Number of book fairs total | fairs 54    
Inventory Write-down, Net Of Reserves   37.6  
Inventory Valuation and Obsolescence      
Class of Stock [Line Items]      
Asset impairments and write downs   $ 40.0  
Leaseholds and Leasehold Improvements      
Class of Stock [Line Items]      
Asset impairments and write downs $ 8.5    
Class A Stock      
Class of Stock [Line Items]      
Impact on earnings per share (USD per share) | $ / shares $ 0.24 $ 0.84