Provision for Income Taxes - Additional Information (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
Sep. 30, 2023 |
Sep. 30, 2022 |
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| Income Tax Contingency [Line Items] | ||
| Deferred tax assets, gross | $ 10,857,000 | $ 10,952,000 |
| Fuel tax credits | 300,000 | 300,000 |
| Goodwill expected to be deductible to tax purposes | 109,500,000 | 92,500,000 |
| Unrecognized tax benefits | 0 | 0 |
| Federal | ||
| Income Tax Contingency [Line Items] | ||
| Operating loss carryforwards | 0 | 10,500,000 |
| State | ||
| Income Tax Contingency [Line Items] | ||
| Operating loss carryforwards | $ 27,800,000 | $ 38,000,000.0 |
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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- Definition The amount deducted from an entities' taxes, reflecting a percentage of an amount invested in certain assets spread over the useful life of those assets; includes deferred investment tax credits. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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 Amount of unrecognized tax benefits. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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