SUPPLEMENTAL BALANCE SHEET INFORMATION - Accrued Expenses (Details) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Sep. 30, 2025 |
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| Accrued Liabilities and Other Liabilities [Abstract] | ||
| Accrued compensation | $ 12,455 | $ 12,832 |
| Non-income taxes | 2,544 | 3,491 |
| Accrued interest | 4,383 | 4,388 |
| Current portion of long-term finance lease | 727 | 495 |
| Other | 9,069 | 7,516 |
| Accrued expenses and other current liabilities | 34,178 | 44,722 |
| US DOJ Resolution and Plea Agreements | ||
| Accrued Liabilities and Other Liabilities [Abstract] | ||
| Agreement in Principle | 5,000 | 5,000 |
| Loss contingency, estimate of possible loss | 17,000 | |
| Securities Class Action Lawsuit | ||
| Accrued Liabilities and Other Liabilities [Abstract] | ||
| Agreement in Principle | $ 0 | $ 11,000 |
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- Definition The amount as of the balance sheet date of accrued expenses and other current liabilities. No definition available.
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- Definition Carrying value as of the balance sheet date of obligations incurred for non-income taxes. No definition available.
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- References No definition available.
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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