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Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2024
Aug. 31, 2023
Disaggregation of Revenue [Line Items]    
Revenues $ 237.2 $ 228.5
Corporate, Non-Segment    
Disaggregation of Revenue [Line Items]    
Revenues 2.7 2.5
Total Children's Book Publishing and Distribution | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues 105.4 102.4
Total Children's Book Publishing and Distribution | Operating Segments | Book Clubs - U.S.    
Disaggregation of Revenue [Line Items]    
Revenues 2.7 2.6
Total Children's Book Publishing and Distribution | Operating Segments | Book Fairs - U.S.    
Disaggregation of Revenue [Line Items]    
Revenues 28.8 27.3
Total Children's Book Publishing and Distribution | Operating Segments | Trade - U.S. (1)    
Disaggregation of Revenue [Line Items]    
Revenues 58.2 62.1
Total Children's Book Publishing and Distribution | Operating Segments | Trade - International    
Disaggregation of Revenue [Line Items]    
Revenues 15.7 10.4
Total Education Solutions | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues 55.7 66.0
Total Entertainment | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues 16.6 0.4
Total Entertainment | Operating Segments | Entertainment - U.S.    
Disaggregation of Revenue [Line Items]    
Revenues 1.6 0.4
Total Entertainment | Operating Segments | Entertainment - International    
Disaggregation of Revenue [Line Items]    
Revenues 15.0 0.0
Total International | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues 56.8 57.2
Total International | Operating Segments | Major Markets    
Disaggregation of Revenue [Line Items]    
Revenues 48.1 47.8
Total International | Operating Segments | Other Markets    
Disaggregation of Revenue [Line Items]    
Revenues $ 8.7 $ 9.4