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Income Taxes - Additional Information (Details) - USD ($) | 3 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Tax Credit Carryforward [Line Items] |  |
Income tax rate | 26.20% | 27.00%
Uncertain tax positions | $ 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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- Definition Amount recognized for uncertainty in income taxes classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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