REVENUES - Remaining Performance Obligations (Details) - USD ($) $ in Thousands	3 Months Ended
Dec. 31, 2023	Sep. 30, 2023
Remaining Performance Obligations
Revenue recognized	$ 24,400
Contract assets	138,400	$ 138,600
Accounts receivable	194,395	198,557
Contract liabilities	131,900	$ 123,100
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Remaining Performance Obligations
Remaining performance obligations amount	$ 847,800
Percentage of remaining performance obligation expected to be recognized	66.00%
Revenue remaining performance obligation expected timing of satisfaction, Period	12 months

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 obligation to transfer good or service to customer for which consideration has been received or is receivable.

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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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