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Summary of Significant Accounting Policies - Revenue Recognition (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2016 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2016
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 256,314 | $ 253,252 | $ 254,872 | $ 251,314 | $ 238,874 | $ 232,864 | $ 217,211 | $ 228,785 | $ 1,015,752 | $ 917,734 | $ 888,519 |
Percentage of impact on total revenue |  |  |  |  |  |  |  |  |  | 0.40% | 0.30% | 0.10%
Reduction in school operating losses included in the entity's revenue |  |  |  |  |  |  |  |  | $ 54,700 | $ 66,700 | $ 61,000 |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 10.00% | 10.00% | 10.00% |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |
Duration of contracts providing access to curriculum via the entity's Web site |  |  |  |  |  |  |  |  | 1 year |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |
Duration of contracts providing access to curriculum via the entity's Web site |  |  |  |  |  |  |  |  | 2 years |  |  |
Primary Obligor |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 342,700 | $ 314,800 | $ 292,000 |
Revenue | Customer Concentration Risk |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |
Number of customers with concentration |  |  |  |  |  |  |  |  | 1 | 0 | 0 |
Revenue | Customer Concentration Risk | Managed Schools |  |  |  |  |  |  |  |  |  |  |  |
Summary of Significant Accounting Policies |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk (as a percent) |  |  |  |  |  |  |  |  | 88.00% | 85.00% |  | 83.00%

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