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Acquisitions - Narrative (Details) - USD ($)
$ in Millions
 11 Months Ended 12 Months Ended
Jun. 20, 2024
Jun. 01, 2023
Sep. 01, 2022
May 31, 2025
May 31, 2025
May 31, 2024
May 31, 2023
Business Combination [Line Items]              
Additional paid-in capital       $ 607.1 $ 607.1 $ 604.6  
Revenues         1,625.5 1,589.7 $ 1,704.0
Net income (loss)         (1.9) 12.1 86.5
Business Combination, Acquisition-Related Cost, Expense         3.0 9.3  
Payments to acquire businesses, net of cash acquired         176.2 6.4 10.7
Goodwill       198.9 198.9 132.8 132.7
Payments to Acquire Additional Interest in Subsidiaries         0.0 2.1 $ 0.0
Education Solutions              
Business Combination [Line Items]              
Goodwill       75.7 $ 75.7 $ 75.7  
9 Story Media Group Inc.              
Business Combination [Line Items]              
Percentage of outstanding shares acquired 100.00%            
Percentage of interests acquired 25.00%            
Revenues       58.0      
Net income (loss)       $ 8.5      
Accounts receivable $ 14.8            
Net assets acquired 129.5            
Goodwill 64.2            
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill $ 193.7            
9 Story Media Group Inc. | Intellectual Property and Customer Contracts/Relationships              
Business Combination [Line Items]              
Acquired finite-lived intangible assets, weighted average useful life 10 years            
9 Story Media Group Inc. | Customer Relationships              
Business Combination [Line Items]              
Acquired finite-lived intangible assets, weighted average useful life 5 years            
Other Intangible assets: $ 51.5            
9 Story Media Group Inc. | Trade Names              
Business Combination [Line Items]              
Acquired finite-lived intangible assets, weighted average useful life 10 years            
Other Intangible assets: $ 16.5            
9 Story Media Group Inc. | Software Development              
Business Combination [Line Items]              
Acquired finite-lived intangible assets, weighted average useful life 3 years            
Other Intangible assets: $ 1.3            
Learning Ovations, Inc.              
Business Combination [Line Items]              
Payments to acquire businesses, net of cash acquired     $ 11.1        
Accounts receivable     $ 0.1        
Business combination, discount rate     0.175        
Net assets acquired     $ 3.6        
Other Intangible assets:     4.1        
Deferred tax liabilities acquired     0.6        
Learning Ovations, Inc. | Education Solutions              
Business Combination [Line Items]              
Goodwill     $ 7.6        
Make Believe Ideas Limited (MBI)              
Business Combination [Line Items]              
Noncontrolling interest, equity, carrying amount   $ 1.6          
Adjustments to additional paid in capital   0.5          
Payments to Acquire Additional Interest in Subsidiaries   $ 2.1          
Scholastic, Inc. | Learning Ovations, Inc.              
Business Combination [Line Items]              
Percentage of interests acquired     100.00%        
Scholastic, Inc. | Make Believe Ideas Limited (MBI)              
Business Combination [Line Items]              
Noncontrolling interest, ownership percentage by parent   100.00%         95.00%