REVENUES - Remaining Performance Obligations (Details) - USD ($) $ in Millions	9 Months Ended
Jun. 30, 2023	Sep. 30, 2022
Remaining Performance Obligations
Remaining performance obligations amount	$ 705.4
Revenue recognized	81.0
Contract assets	128.3
Contract liabilities	$ 133.6
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
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-07-01
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

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Name Accounting Standards Codification
-Section 45
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-URI https://asc.fasb.org//1943274/2147479837/606-10-45-1

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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

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

+ References

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

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

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