v3.25.2
Segment Information - Schedule of segment reporting information (Details)
$ in Millions
 3 Months Ended
Aug. 31, 2025
USD ($)
segment
Aug. 31, 2024
USD ($)
May 31, 2025
USD ($)
Segment Reporting Information [Line Items]      
Number of reportable segments | segment 4    
Revenues $ 225.6 $ 237.2  
Segment operating income (loss) (92.2) (88.5)  
Cost of goods sold 123.5 128.3  
Selling, general and administrative expenses 177.2 182.1  
Depreciation and amortization 16.3 15.3  
Segment Reporting, Other Segment Item, Amount 0.8    
Interest Income (Expense), Nonoperating (4.5) (3.0)  
Other components of net periodic benefit (cost) (0.3) (0.3)  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest (97.0) (91.8)  
Assets 1,954.6 1,960.0 $ 1,950.1
Segment, Expenditure, Addition to Long-Lived Assets 7.4 14.6  
Income from equity-method investments $ (0.1) 0.2  
Total Children's Book Publishing and Distribution      
Segment Reporting Information [Line Items]      
Number of operating segments | segment 2    
Total Education Solutions      
Segment Reporting Information [Line Items]      
Number of operating segments | segment 1    
Total Entertainment      
Segment Reporting Information [Line Items]      
Number of operating segments | segment 1    
Income from equity-method investments $ 0.1 0.2  
Total International      
Segment Reporting Information [Line Items]      
Number of operating segments | segment 4    
Income from equity-method investments $ (0.1) 0.1  
Operating Segments | Total Children's Book Publishing and Distribution      
Segment Reporting Information [Line Items]      
Revenues 109.4 105.4  
Segment operating income (loss) (35.1) (36.6)  
Cost of goods sold 62.2 58.9  
Selling, general and administrative expenses 76.1 77.5  
Depreciation and amortization 5.4 5.6  
Segment Reporting, Other Segment Item, Amount 0.8    
Assets 634.7 604.3  
Segment, Expenditure, Addition to Long-Lived Assets 1.2 8.4  
Operating Segments | Total Education Solutions      
Segment Reporting Information [Line Items]      
Revenues 40.1 55.7  
Segment operating income (loss) (21.2) (17.0)  
Cost of goods sold 19.3 27.4  
Selling, general and administrative expenses 39.3 42.7  
Depreciation and amortization 2.7 2.6  
Segment Reporting, Other Segment Item, Amount 0.0    
Assets 211.1 206.9  
Segment, Expenditure, Addition to Long-Lived Assets 0.1 0.0  
Operating Segments | Total Entertainment      
Segment Reporting Information [Line Items]      
Revenues 13.6 16.6  
Segment operating income (loss) (4.0) (0.5)  
Cost of goods sold 8.1 8.3  
Selling, general and administrative expenses 6.4 6.5  
Depreciation and amortization 3.1 2.3  
Segment Reporting, Other Segment Item, Amount 0.0    
Assets 255.5 285.8  
Segment, Expenditure, Addition to Long-Lived Assets 0.0 0.0  
Operating Segments | Total International      
Segment Reporting Information [Line Items]      
Revenues 59.4 56.8  
Segment operating income (loss) (4.2) (8.3)  
Cost of goods sold 35.4 35.3  
Selling, general and administrative expenses 26.8 28.3  
Depreciation and amortization 1.4 1.5  
Segment Reporting, Other Segment Item, Amount 0.0    
Assets 261.0 249.4  
Segment, Expenditure, Addition to Long-Lived Assets 3.4 2.2  
Segment Reporting, Reconciling Item, Corporate Nonsegment      
Segment Reporting Information [Line Items]      
Revenues 3.1 2.7  
Segment operating income (loss) (27.7) (26.1)  
Cost of goods sold (1.5) (1.6)  
Selling, general and administrative expenses 28.6 27.1  
Depreciation and amortization 3.7 3.3  
Segment Reporting, Other Segment Item, Amount 0.0    
Assets 592.3 613.6  
Segment, Expenditure, Addition to Long-Lived Assets 2.7 4.0  
Segment Reporting, Reconciling Item, Corporate Nonsegment | Overhead      
Segment Reporting Information [Line Items]      
Revenues $ 3.1 $ 2.7