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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, 2025
May 31, 2024
May 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived asset additions $ 32.1 $ 35.7 $ 36.5
Long-lived assets 464.5 457.3 458.7
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 431.7 430.5 432.8
International      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 32.8 26.8 25.9
Operating Segments | Children's Book Publishing and Distribution      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived asset additions 12.3 18.2 10.6
Operating Segments | Education Solutions      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived asset additions 0.9 0.0 0.3
Operating Segments | International      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived asset additions 3.9 2.6 3.3
Overhead      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived asset additions $ 14.7 $ 14.9 $ 22.3