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Summary of Significant Accounting Policies - Leases (Details) - USD ($) $ in Thousands | Oct. 01, 2019 | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease liability |  | $ 36,437 |
Operating lease right of use assets |  | $ 34,663 | $ 0
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201602Member |  |
Deferred rent payable, net of current portion |  |  | $ 1,620
ASU 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating lease liability | $ 39,746 |  |
Operating lease right of use assets | 38,126 |  |
Deferred rent payable, net of current portion | $ 1,620 |  |

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