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Merger with Capella Education Company - Additional Information (Details) |  | 3 Months Ended | 9 Months Ended | 11 Months Ended
--- | --- | --- | --- | ---
Aug. 01, 2018 USD ($) University | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2019 USD ($)
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |  |  |
Business Acquisition, Pro Forma Revenue |  |  |  | $ 224,641,000 |  | $ 679,309,000 |
Revenue |  |  |  |  |  | 46.1 |
Net income (loss) |  |  |  |  |  | 43.1 |
Number of independent universities | University | 2 |  |  |  |  |  |
Goodwill |  | $ 732,075,000 | $ 732,540,000 |  | $ 732,075,000 |  |
Merger costs |  | 1,500,000 |  | 29,620,000 | 11,698,000 | 37,791,000 |
Goodwill measurement period adjustment |  |  |  |  | (465,000) |  |
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  | (14,146,000) |  | 10,606,000 |
Capella Merger |  |  |  |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |  |  |
Revenue |  |  |  | $ 46,100,000 |  |  |
Net income (loss) |  |  |  |  |  | $ 43,100,000 |
Share conversion ratio of common stock issued | 0.875 |  |  |  |  |  |
Goodwill | $ 725,275,000 |  |  |  |  |  |
Merger costs |  |  |  |  |  |  | $ 20,100,000
Issuance costs | 100,000 |  |  |  |  |  |
Reduction in cash and cash equivalent |  |  | 500,000 |  |  |  |
Reduction in other assets |  |  | 1,400,000 |  |  |  |
Reduction in deferred tax liabilities |  |  | 100,000 |  | 3,800,000 |  |
Reduction in current assets |  |  |  |  | 1,900,000 |  |
Increase in current liabilities |  |  |  |  | 1,300,000 |  |
Increase in noncurrent liabilities |  |  |  |  | 100,000 |  |
Goodwill measurement period adjustment |  |  | 1,800,000 |  | (500,000) |  |
Course content and internally developed software including in Property and Equipment | $ 53,182,000 |  |  |  |  |  |
Amortization period (in years) | 3 years |  |  |  |  |  |
Strayer University |  |  |  |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |  |  |
Goodwill | $ 330,600,000 | 337,381,000 | 337,381,000 |  | 337,381,000 |  |
Goodwill measurement period adjustment |  |  |  |  | 0 |  |
Capella University |  |  |  |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |  |  |
Goodwill | 394,700,000 | $ 394,694,000 | $ 395,159,000 |  | 394,694,000 |  |
Goodwill measurement period adjustment |  |  |  |  | $ (465,000) |  |
Relief From Royalty Approach Valuation Technique | Capella Merger |  |  |  |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |  |  |
Course content and internally developed software including in Property and Equipment | 14,000,000.0 |  |  |  |  |  |
Valuation, Cost Approach | Capella Merger |  |  |  |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |  |  |
Course content and internally developed software including in Property and Equipment | $ 5,000,000.0 |  |  |  |  |  |

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