RELATED PARTY TRANSACTIONS (Details) - USD ($) |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Sep. 30, 2025 |
|
| Related Party Transaction [Line Items] | |||||
| Total sales | $ 215,300,000 | $ 214,600,000 | $ 1,064,600,000 | $ 1,016,400,000 | |
| Total receivables | 149,900,000 | 149,900,000 | $ 179,600,000 | ||
| Accounts payable | 92,400,000 | 92,400,000 | 96,000,000.0 | ||
| Purchased of salt-treatment materials | 0.0 | 2,200,000 | |||
| Related Party | |||||
| Related Party Transaction [Line Items] | |||||
| Total sales | 100,000 | $ 900,000 | 1,000,000.0 | $ 2,900,000 | |
| Total receivables | 100,000 | 100,000 | 200,000 | ||
| Accounts payable | 0 | 0 | $ 0 | ||
| Related Party | Salt-Treatment Material Purchase | |||||
| Related Party Transaction [Line Items] | |||||
| Accounts payable | $ 0 | $ 0 | |||
| X | ||||||||||
- Definition Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value. Reference 1: http://www.xbrl.org/2003/role/exampleRef
|
| X | ||||||||||
- 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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. No definition available.
|
| X | ||||||||||
- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|