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Acquisitions (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 01, 2022
May 31, 2023
May 31, 2022
May 31, 2021
Business Acquisition [Line Items]        
Payments to acquire businesses, net of cash acquired   $ 10.7 $ 0.0 $ 0.0
Acquired receivable, fair value $ 0.1      
Intangible assets acquired   4.1 0.0  
Deferred tax liabilities acquired $ 0.6      
Goodwill acquired   7.6 $ 0.0  
Learning Ovations, Inc.        
Business Acquisition [Line Items]        
Percentage of interests acquired 100.00%      
Payments to acquire businesses, net of cash acquired $ 11.1      
Net assets acquired 3.6      
Intangible assets acquired $ 4.1 $ 4.1    
Learning Ovations, Inc. | Valuation Technique, Discounted Cash Flow        
Business Acquisition [Line Items]        
Business combination, discount rate 0.175