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Property, Plant and Equipment - Schedule of Long Lived Assets by Reportable Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2024
May 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]    
Additions $ 36.6 $ 37.6
Long-lived assets 457.3 458.7
U.S.    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 430.5 432.8
Non-US    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Long-lived assets 26.8 25.9
Operating Segments | Children's Book Publishing and Distribution    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Additions 18.2 10.6
Long-lived assets 44.8 34.4
Operating Segments | Education Solutions    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Additions 0.0 0.3
Long-lived assets 7.2 2.1
Operating Segments | International    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Additions 3.5 4.4
Long-lived assets 26.0 25.1
Corporate, Non-Segment | Overhead    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Additions 14.9 22.3
Long-lived assets $ 379.3 $ 397.1