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Income Taxes - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Tax Credit Carryforward [Line Items] |  |  |  |
Income tax rate | 26.80% | 29.90% | 26.70% | 27.70%
Uncertain tax positions | $ 0 |  | $ 0 |
Tax Year 2020 | US |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Income tax subject to audit |  |  | 2020 |
Tax Year 2020 | State |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Income tax subject to audit |  |  | 2020 |
Tax Year 2019 | US |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Income tax subject to audit |  |  | 2019 |
Tax Year 2019 | State |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Income tax subject to audit |  |  | 2019 |
Tax Year 2018 | US |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Income tax subject to audit |  |  | 2018 |
Tax Year 2018 | State |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Income tax subject to audit |  |  | 2018 |
Tax Year 2017 | US |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Income tax subject to audit |  |  | 2017 |
Tax Year 2017 | State |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Income tax subject to audit |  |  | 2017 |
Tax Year 2016 | State |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Income tax subject to audit |  |  | 2016 |

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