REVENUES - Remaining Performance Obligations (Details) - USD ($) $ in Thousands	9 Months Ended
Jun. 30, 2024	Sep. 30, 2023
Remaining Performance Obligations
Contract assets	$ 134,600	$ 138,600
Contract liabilities	123,500	123,100
Accounts receivable	213,592	$ 198,557
Revenue recognized	54,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-07-01
Remaining Performance Obligations
Remaining performance obligations amount	$ 888,700
Revenue remaining performance obligation expected timing of satisfaction, Period	12 months
Percentage of remaining performance obligation expected to be recognized	68.00%

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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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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