v3.26.1
Property, Plant and Equipment - Schedule of Long Lived Assets by Reportable Segment (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2026
May 31, 2025
May 31, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived asset additions $ 35.2 $ 32.1 $ 35.7
Long-lived assets 149.2 464.5 457.3
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 102.6 431.7 430.5
International      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets 46.6 32.8 26.8
Operating Segments | Children's Book Publishing and Distribution      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived asset additions 5.4 12.3 18.2
Operating Segments | Education      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived asset additions 0.1 0.9 0.0
Operating Segments | International      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived asset additions 14.9 3.9 2.6
Overhead      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived asset additions $ 13.4 $ 14.7 $ 14.9