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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Revenue From Contract With Customer [Line Items] |  |  |
Revenue from performance contracts | $ 1,200.0 | $ 1,200.0 | $ 1,200.0
Performance bonuses recognized | 65.5 | 56.6 | 47.3
Early termination revenue | 2.3 | 13.4 | $ 2.3
Capitalized fulfillment costs | 34.8 | $ 19.2 |
Amount of remaining performance obligation | $ 4,800.0 |  |
Period of unsatisfied performance obligations represented in backlog contracts with month-to-month terms | 1 month |  |
Accounts receivable payment period | 30 days |  |
KCA Deutag |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Amount of remaining performance obligation | $ 3,600.0 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01 |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Amount of remaining performance obligation | 1,500.0 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-10-01 |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Amount of remaining performance obligation | 700.0 |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2027-10-01 |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Amount of remaining performance obligation | $ 2,600.0 |  |

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- Definition Period for outstanding accounts receivable to be received by entity, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Contract with Customer Liability Revenue Recognized Including Opening Balance + References No definition available. + Details
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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 The number of months of unsatisfied performance obligations represented in entity's backlog for contracts that currently contain month-to-month terms. + 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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- Definition Amount of transaction price allocated to performance obligation that has not been recognized as revenue. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -SubTopic 10 -Topic 606 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-13 + Details
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