Significant Accounting Policies - Additional Information (Details) |
12 Months Ended | |||
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Sep. 30, 2024
USD ($)
segment
reportable_unit
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Sep. 30, 2023
USD ($)
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Sep. 30, 2022
USD ($)
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Oct. 01, 2021
USD ($)
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| Summary Of Accounting Policies [Line Items] | ||||
| Restricted cash | $ 1,998,000 | $ 837,000 | ||
| Restricted investments | 18,020,000 | 15,079,000 | ||
| Debt securities, available-for-sale, allowance for credit loss | 0 | 0 | ||
| Weighted average cost inventory amount | 95,800,000 | 75,500,000 | ||
| FIFO inventory amount | $ 10,900,000 | 8,500,000 | ||
| Number of operating segments | segment | 1 | |||
| Number of reporting units | reportable_unit | 1 | |||
| Amount retained for each claim paid | $ 1,000,000 | |||
| Amount retained by CIRCA per claim paid | $ 550,000 | |||
| Capitalized costs, pre-production stripping costs | $ 1,700,000 | 800,000 | ||
| Production costs, period cost | 3,200,000 | $ 3,100,000 | $ 1,700,000 | |
| Minimum | ||||
| Summary Of Accounting Policies [Line Items] | ||||
| Stop-loss insurance purchased | 100,000 | |||
| Maximum | ||||
| Summary Of Accounting Policies [Line Items] | ||||
| Stop-loss insurance purchased | $ 200,000 | |||
| X | ||||||||||
- Definition Amount Retained By Group Captive Insurance Per Claim Paid No definition available.
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- Definition Amount Retained Per Claim Paid No definition available.
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- Definition Capitalized Costs, Pre-production Stripping Costs No definition available.
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- Definition Stop-Loss Insurance Purchased To Limit Claim Claim Loss No definition available.
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| X | ||||||||||
- Definition Summary Of Accounting Policies [Line Items] No definition available.
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| X | ||||||||||
- Definition Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The amount of FIFO (first in first out) inventory present at the reporting date when inventory is also valued using different valuation methods. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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| X | ||||||||||
- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. No definition available.
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- Definition Amount of capitalized production cost incurred during period for oil- and gas-producing activities. Includes cost incurred to operate and maintain well and related equipment and facility. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition This element represents the noncurrent portion of investments which are not defined as or included in marketable (debt, equity, or other) securities that are pledged or subject to withdrawal restrictions. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The amount of weighted average cost inventory present at the reporting date when inventory is valued using different valuation methods. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Details
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- Details
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