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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Early termination revenue	$ 0	$ 49,500	$ 7,700	$ 57,800
Drilling services	329,774	314,405	868,581	1,556,093
Capitalized cost	3,600		3,600		$ 6,200
Notification Fee
Disaggregation of Revenue [Line Items]
Drilling services	$ 0	$ 900	$ 0	$ 3,000

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Revenue related to early termination of contract.

+ References

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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
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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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