| Income Taxes - Additional Information (Details) $ in Millions | 12 Months Ended | 
|---|---|
| Sep. 30, 2021  USD ($) | |
| Tax Credit Carryforward [Line Items] | |
| Income tax examination year | 2017 | 
| Income tax examination completion date | Sep. 30, 2021 | 
| Income tax examination, description | The Company was under IRS examination for the September 30, 2017 tax year, however, the matter was closed with no proposed adjustments. | 
| Valuation allowance | $ 0.8 | 
| Federal | |
| Tax Credit Carryforward [Line Items] | |
| Net operating loss carryforward | 0.0 | 
| State | |
| Tax Credit Carryforward [Line Items] | |
| Net operating loss carryforward | $ 7.3 | 
| Operating loss carryforward expiration date | Dec. 31, 2034 | 
| Tax credit carryforwards | $ 0.7 | 
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- Definition Income tax examination completion date. No definition available. 
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- Definition Valuation allowance of deferred tax asset No definition available. 
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- Definition A brief description of status of the tax examination, significant findings to date, and the entity's position with respect to the findings. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Tax year being audited in the income tax examination, in YYYY format. No definition available. 
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Expiration date of each operating loss carryforward included in operating loss carryforward, in YYYY-MM-DD format. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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