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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2023
Revenue from Contract with Customer [Abstract]
Revenue from performance contracts	$ 298.2	$ 270.0
Contract with Customer Liability Revenue Recognized Including Opening Balance on Achievement of Performance Targets	15.2	10.1
Early Termination Revenue	5.4	$ 0.7
Capitalized fulfillment costs	$ 12.4		$ 11.4

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- Definition

ContractWithCustomerLiabilityRevenueRecognizedIncludingOpeningBalance

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- Definition

Contract with Customer Liability Revenue Recognized Including Opening Balance on Achievement of Performance Targets

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- Definition

Early Termination Revenue

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- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 340
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479483/340-40-50-3

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