SUPPLEMENTAL BALANCE SHEET INFORMATION - Accrued Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2025	Sep. 30, 2024
Loss Contingencies
Accrued compensation	$ 12,832	$ 10,851
Non-income taxes	3,491	4,409
Accrued interest	4,388	3,017
Current portion of long-term finance lease	495	211
Other	7,516	4,730
Accrued expenses and other liabilities	44,722	28,218
Loss contingency, accrual, noncurrent	12,792	17,000
US DOJ Agreement
Loss Contingencies
Resolution and Plea Agreements (1)	5,000	5,000
Amount paid	5,000	6,500
Loss contingency, estimate of possible loss	$ 17,000
Interest rate	4.18%
Securities Class Action Lawsuit
Loss Contingencies
Resolution and Plea Agreements (1)	$ 11,000	$ 0
Loss contingency accrual	$ 11,000

The amount as of the balance sheet date of accrued expenses and other current liabilities.

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Carrying value as of the balance sheet date of obligations incurred for non-income taxes.

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Loss Contingency, Accrual, Interest Rate

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Present value of lessee's discounted obligation for lease payments from finance lease, classified as current.

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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).

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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.

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Amount of loss contingency liability.

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Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer.

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Amount of loss contingency liability expected to be resolved after one year or beyond the normal operating cycle, if longer.

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Amount of cash outflow reducing loss contingency liability.

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Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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Amount of liabilities classified as other, due within one year or the normal operating cycle, if longer.

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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).

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