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Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Aug. 31, 2023
Aug. 31, 2022
Disaggregation of Revenue [Line Items]    
Revenues $ 228.5 $ 262.9
Total Revenues excluding rental income 226.0 262.9
Lease Income 2.5 1.5
Children's Book Publishing & Distribution    
Disaggregation of Revenue [Line Items]    
Revenues 102.8 124.7
Children's Book Publishing & Distribution | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues 102.8 124.7
Children's Book Publishing & Distribution | Book Clubs - U.S.    
Disaggregation of Revenue [Line Items]    
Revenues 2.6 6.3
Children's Book Publishing & Distribution | Book Fairs - U.S.    
Disaggregation of Revenue [Line Items]    
Revenues 27.3 28.3
Children's Book Publishing & Distribution | Trade - U.S.    
Disaggregation of Revenue [Line Items]    
Revenues 62.5 76.2
Children's Book Publishing & Distribution | Trade - International    
Disaggregation of Revenue [Line Items]    
Revenues 10.4 13.9
Education    
Disaggregation of Revenue [Line Items]    
Revenues 66.0 73.2
Education | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues 66.0 73.2
International    
Disaggregation of Revenue [Line Items]    
Revenues 57.2 65.0
International | Operating Segments    
Disaggregation of Revenue [Line Items]    
Revenues 57.2 65.0
International | Major Markets    
Disaggregation of Revenue [Line Items]    
Revenues 47.8 53.4
International | Other Markets    
Disaggregation of Revenue [Line Items]    
Revenues $ 9.4 $ 11.6