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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	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

X

- 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.

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- Definition

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

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- Definition

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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.

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[Line Items] for Revenue From Contract With Customer [Table]

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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

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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

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