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Summary of Significant Accounting Policies - Disaggregation of revenue (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
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Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2020 USD ($) item | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($)
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |
Number of lines of business | item |  |  |  |  |  |  |  |  | 3 |  |
Total Revenues | $ 268,931 | $ 257,154 | $ 257,559 | $ 257,121 | $ 256,314 | $ 253,252 | $ 254,872 | $ 251,314 | $ 1,040,765 | $ 1,015,752 | $ 917,734
Managed Public School Programs |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 920,080 | 890,275 |
Institutional |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 74,960 | 89,953 |
Non-managed Public School Programs |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 36,195 | 50,623 |
Institutional Software & Services |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | 38,765 | 39,330 |
Private Pay Schools and Other |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |
Total Revenues |  |  |  |  |  |  |  |  | $ 45,725 | $ 35,524 |

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