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Asset Write Down (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
May 31, 2023
USD ($)
May 31, 2022
USD ($)
$ / shares
May 31, 2021
USD ($)
bookFair
$ / shares
May 31, 2021
fairs
Asset Write Down [Line Items]        
Assets held for sale $ 0.0 $ 3.7    
Gain (Loss) on assets held for sale 0.0 $ (15.1) $ 0.0  
Loss on assets held for sale, impact on earnings per share, basic | $ / shares   $ 0.33    
Loss on assets held for sale, impact on earnings per share, diluted | $ / shares   $ 0.32    
Asset impairments and write downs $ 0.0 $ 0.4 11.1  
Impairment on right-of-use assets     7.0  
Impairment expense on other long-lived assets     $ 1.5  
Number of book fair closed     13 13
Number of book fairs total     54 54
Asset impairment expense     $ 2.6  
Non cash write off related to asset impairments and write downs     $ 11.1  
Class A Stock        
Asset Write Down [Line Items]        
Impact on earnings per share (USD per share) | $ / shares     $ 0.24  
Leaseholds and Leasehold Improvements        
Asset Write Down [Line Items]        
Asset impairments and write downs     $ 8.5