REVENUES - Remaining Performance Obligations (Details) - USD ($) $ in Millions	6 Months Ended
Mar. 31, 2023	Sep. 30, 2022
Remaining Performance Obligations
Remaining performance obligations amount	$ 740.9
Revenue recognized	55.0
Contract assets	128.2
Contract liabilities	$ 131.7
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
Remaining Performance Obligations
Percentage of remaining performance obligation expected to be recognized	79.00%
Revenue remaining performance obligation expected timing of satisfaction, Period	12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01
Remaining Performance Obligations
Contract assets		$ 125.2
Contract liabilities		$ 137.6

Amount, after 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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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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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