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Summary of Significant Accounting Policies - Capitalized Software-as-a-Service Costs (Details) - Capitalized computer software as service - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Property and equipment, net      
Capitalized software written down $ 0.0 $ 0.0  
Prepaid expenses      
Property and equipment, net      
Capitalized software, net 15.2   $ 13.3
Deposits and other assets      
Property and equipment, net      
Capitalized software, net 41.7   $ 44.1
Instructional costs and services      
Property and equipment, net      
Amortization expense 0.7 0.0  
Selling, General and Administrative Expenses      
Property and equipment, net      
Amortization expense $ 4.3 $ 3.5  
Minimum      
Property and equipment, net      
Capitalized software as service useful life 3 years    
Maximum      
Property and equipment, net      
Capitalized software as service useful life 5 years