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Goodwill and Other Intangibles - Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Aug. 31, 2024
Aug. 31, 2023
May 31, 2024
May 31, 2023
Goodwill [Line Items]        
Additions   $ 0 $ 0  
Goodwill, Impairment Loss $ 0 0 0  
Amortizable intangible assets acquired $ 85,300,000 0 6,000,000.0  
Useful life 9 years      
Impairment of Intangible Assets, Finite-Lived     3,100,000  
Impairment of intangible assets (excluding goodwill) $ 0 $ 0    
Amortizable Intangible Assets - Educational Programs        
Goodwill [Line Items]        
Amortizable intangible assets acquired     $ 5,800,000  
Useful life     8 years  
Amortizable Intangible Assets - Children's Book Publishing Business        
Goodwill [Line Items]        
Amortizable intangible assets acquired     $ 200,000  
Useful life     5 years  
9 Story Media Group Inc.        
Goodwill [Line Items]        
Additions 70,100,000      
Amortizable intangible assets acquired $ 85,300,000      
Learning Ovations, Inc.        
Goodwill [Line Items]        
Amortizable intangible assets acquired       $ 4,100,000