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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Sep. 30, 2025
Revenue from Contract with Customer [Abstract] |  |  |  |  |
Revenue from performance contracts | $ 311.5 | $ 309.8 | $ 884.8 | $ 941.4 |
Performance bonuses recognized | 14.7 | $ 14.1 | 42.5 | $ 48.1 |
Capitalized fulfillment costs | $ 31.2 |  | $ 31.2 |  | $ 34.8

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- Definition Contract with Customer Liability Revenue Recognized Including Opening Balance on Achievement of Performance Targets + References No definition available. + Details
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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. + References 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 + Details
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