v3.26.3
Segment Information - Schedule of segment reporting information (Details) - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2026
Aug. 31, 2025
May 31, 2026
Segment Reporting [Line Items]      
Revenues $ 216.8 $ 225.6  
Cost of goods sold 118.1 123.5  
Selling, general and administrative expenses 178.3 177.2  
Depreciation and amortization 12.6 16.3  
Other segment items   0.8  
Operating income (loss) (92.2) (92.2)  
Interest income (expense), net (1.6) (4.5)  
Other components of net periodic benefit (cost) 0.1 (0.3)  
Earnings (loss) before income taxes (93.7) (97.0)  
Segment assets 1,725.3 1,954.6 $ 1,728.1
Long-lived asset additions 10.8 7.4  
Income from equity-method investments 0.0 (0.1)  
Total Entertainment      
Segment Reporting [Line Items]      
Income from equity-method investments   0.1  
Total International      
Segment Reporting [Line Items]      
Income from equity-method investments   (0.1)  
Operating Segments | Total Children's Book Publishing and Distribution      
Segment Reporting [Line Items]      
Revenues 105.8 109.4  
Cost of goods sold 55.4 62.2  
Selling, general and administrative expenses 83.3 76.1  
Depreciation and amortization 5.3 5.4  
Other segment items   0.8  
Operating income (loss) (38.2) (35.1)  
Segment assets 620.8 634.7  
Long-lived asset additions 4.8 1.2  
Operating Segments | Total Education      
Segment Reporting [Line Items]      
Revenues 30.4 40.1  
Cost of goods sold 14.8 19.3  
Selling, general and administrative expenses 36.3 39.3  
Depreciation and amortization 2.6 2.7  
Other segment items   0.0  
Operating income (loss) (23.3) (21.2)  
Segment assets 188.5 211.1  
Long-lived asset additions 0.0 0.1  
Operating Segments | Total Entertainment      
Segment Reporting [Line Items]      
Revenues 20.1 13.6  
Cost of goods sold 12.0 8.1  
Selling, general and administrative expenses 6.8 6.4  
Depreciation and amortization 3.1 3.1  
Other segment items   0.0  
Operating income (loss) (1.8) (4.0)  
Segment assets 245.6 255.5  
Long-lived asset additions 0.8 0.0  
Operating Segments | Total International      
Segment Reporting [Line Items]      
Revenues 60.5 59.4  
Cost of goods sold 36.1 35.4  
Selling, general and administrative expenses 25.9 26.8  
Depreciation and amortization 1.4 1.4  
Other segment items   0.0  
Operating income (loss) (2.9) (4.2)  
Segment assets 246.6 261.0  
Long-lived asset additions 3.2 3.4  
Overhead      
Segment Reporting [Line Items]      
Revenues 0.0 3.1  
Cost of goods sold (0.2) (1.5)  
Selling, general and administrative expenses 26.0 28.6  
Depreciation and amortization 0.2 3.7  
Other segment items   0.0  
Operating income (loss) (26.0) (27.7)  
Segment assets 423.8 592.3  
Long-lived asset additions $ 2.0 $ 2.7