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Organization and Nature of Business (Detail) T in Millions | Sep. 30, 2025 T | Mar. 31, 2022 T | Sep. 30, 2020 mine T
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Number of mines and related facilities acquired | mine |  |  | 2
Oakdale, Wisconsin |  |  |
Business Acquisition [Line Items] |  |  |
Processing capacity | 5.5 |  |
Blair, Wisconsin |  |  |
Business Acquisition [Line Items] |  |  |
Processing capacity |  | 2.9 |
BNSF | Ottawa, Illinois |  |  |
Business Acquisition [Line Items] |  |  |
Processing capacity |  |  | 1.6

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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-5 + Details
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