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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 | 9 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Jun. 30, 2024
Property and equipment, net |  |  |  |  |
Capitalized software written down | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 |
Instructional costs and services |  |  |  |  |
Property and equipment, net |  |  |  |  |
Amortization expense | 0.9 | 0.0 | 2.5 | 0.0 |
Selling, general and administrative expenses |  |  |  |  |
Property and equipment, net |  |  |  |  |
Amortization expense | 3.8 | $ 4.1 | 12.0 | $ 11.2 |
Prepaid expenses |  |  |  |  |
Property and equipment, net |  |  |  |  |
Capitalized software, net | 17.5 |  | 17.5 |  | $ 13.3
Deposits and other assets |  |  |  |  |
Property and equipment, net |  |  |  |  |
Capitalized software, net | $ 41.6 |  | $ 41.6 |  | $ 44.1
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 |  |

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