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Asset Write Down (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
May 31, 2025
May 31, 2024
May 31, 2023
Asset Write Down [Line Items]      
Asset impairments and write downs $ 2.9 $ 10.0 $ 0.0
Operating lease, impairment loss 0.6 3.9  
Operating lease right-of-use assets, net $ 103.9 $ 99.1  
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]   Asset impairments and write downs  
Impact to EPS, basic (in dollars per share) $ 0.08 $ 0.25  
Impact to EPS, diluted (in dollars per share) $ 0.08 $ 0.25  
Overhead      
Asset Write Down [Line Items]      
Operating lease, impairment loss $ 0.1    
Education Solutions      
Asset Write Down [Line Items]      
Asset impairments and write downs 0.6 $ 6.1  
Overhead      
Asset Write Down [Line Items]      
Operating lease right-of-use assets, net   2.3  
International      
Asset Write Down [Line Items]      
Asset impairments and write downs 1.1    
Operating lease right-of-use assets, net   1.1  
Children's Book Publishing and Distribution      
Asset Write Down [Line Items]      
Asset impairments and write downs 0.6    
Operating lease right-of-use assets, net   $ 0.5  
Entertainment      
Asset Write Down [Line Items]      
Operating lease, impairment loss $ 0.5