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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2024
Revenue from Contract with Customer [Abstract]
Revenue from performance contracts	$ 309.8	$ 294.4	$ 941.4	$ 880.4
Performance bonuses recognized	14.1	$ 11.8	48.1	$ 37.4
Capitalized fulfillment costs	$ 33.2		$ 33.2		$ 19.2

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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

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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