REVENUE FROM CONTRACTS WITH CUSTOMERS - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Jun. 30, 2025	Sep. 30, 2024
Contract assets
Contract assets: Trade receivables	$ 74,576	$ 65,867
Contract assets: Unbilled revenue	10,614	14,624
Contract liabilities
Client deposits	21,724	24,898
Deferred revenue	18,527	17,088
Unpaid advanced client billings excluded from client receivables	$ 12,170	$ 10,399
Percentage of revenue billed from unbilled revenue	80.00%
Percentage of contract liabilities recognized as revenue	71.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01
Contract liabilities
Deferred revenue to be recognized (percent)	80.00%
Deferred revenue recognition period	12 months

Contract With Customer Asset And The Contract With Customer Receivable, Current

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The percentage of contract liabilities recognized as revenue.

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The percentage of revenue billed from unbilled.

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Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

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-Topic 606
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- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right to consideration is unconditional, classified as current.

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Current regulatory liabilities generally represent obligations to make refunds to customers for various reasons including overpayment.

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Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Percentage of remaining performance obligation to total remaining performance obligation not recognized as revenue.

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