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Revenues - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Feb. 28, 2026
Feb. 28, 2025
Feb. 28, 2026
Feb. 28, 2025
Disaggregation of Revenue [Line Items]        
Revenues $ 329.1 $ 335.4 $ 1,105.8 $ 1,117.2
Overhead        
Disaggregation of Revenue [Line Items]        
Revenues 0.7 2.8 7.2 8.4
Total Children's Book Publishing and Distribution | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues 197.6 203.3 687.9 675.7
Total Children's Book Publishing and Distribution | Operating Segments | Book Clubs - U.S.        
Disaggregation of Revenue [Line Items]        
Revenues 14.6 15.2 44.9 51.1
Total Children's Book Publishing and Distribution | Operating Segments | Book Fairs - U.S.        
Disaggregation of Revenue [Line Items]        
Revenues 113.3 110.7 389.4 370.5
Total Children's Book Publishing and Distribution | Operating Segments | Trade - U.S.        
Disaggregation of Revenue [Line Items]        
Revenues 62.5 68.9 226.6 218.1
Total Children's Book Publishing and Distribution | Operating Segments | Trade - International        
Disaggregation of Revenue [Line Items]        
Revenues 7.2 8.5 27.0 36.0
Total Education Solutions | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues 56.1 57.2 158.4 184.1
Total Entertainment | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues 16.0 12.8 44.7 46.2
Total Entertainment | Operating Segments | Entertainment - U.S.        
Disaggregation of Revenue [Line Items]        
Revenues 2.0 1.0 5.0 3.9
Total Entertainment | Operating Segments | Entertainment - International        
Disaggregation of Revenue [Line Items]        
Revenues 14.0 11.8 39.7 42.3
Total International | Operating Segments        
Disaggregation of Revenue [Line Items]        
Revenues 58.7 59.3 207.6 202.8
Total International | Operating Segments | Major Markets        
Disaggregation of Revenue [Line Items]        
Revenues 48.7 49.7 175.9 173.4
Total International | Operating Segments | Other Markets        
Disaggregation of Revenue [Line Items]        
Revenues $ 10.0 $ 9.6 $ 31.7 $ 29.4