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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2020 USD ($) month	Mar. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)
Disaggregation of Revenue [Line Items]
Contract drilling services	$ 630,290	$ 717,653	$ 1,241,688	$ 1,455,011
Early termination revenue	8,200	1,200	8,300	8,300
Capitalized cost	9,900		$ 9,900		$ 13,900
Number of months of unsatisfied performance obligations represent in our backlog relating to contract that currently contain month-to-month terms | month			1
Notification Fee
Disaggregation of Revenue [Line Items]
Contract drilling services	$ 2,200	$ 300	$ 2,100	$ 300

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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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- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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