REVENUES - Remaining Performance Obligations (Details) - USD ($) $ in Thousands	6 Months Ended
Mar. 31, 2024	Sep. 30, 2023
Remaining Performance Obligations
Contract assets	$ 139,300	$ 138,600
Contract liabilities	117,800	123,100
Accounts receivable	187,535	$ 198,557
Revenue recognized	44,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01
Remaining Performance Obligations
Remaining performance obligations amount	$ 837,700
Revenue remaining performance obligation expected timing of satisfaction, Period	12 months
Percentage of remaining performance obligation expected to be recognized	70.00%

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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