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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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- 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 + Details
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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. + 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 + Details
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