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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Revenue From Contract With Customer [Line Items]
Early termination revenue	$ 7,700	$ 73,400	$ 11,300
Drilling services	1,210,800	1,761,714	2,785,557
Capitalized fulfillment costs	$ 4,300	6,200
Period of unsatisfied performance obligations represented in backlog contracts with month-to-month terms	1 month
Accounts receivable payment period	30 days
Notification Fee
Revenue From Contract With Customer [Line Items]
Drilling services	$ 0	$ 2,900	$ 1,200

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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Early Termination Revenue

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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