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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 USD ($) month | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($)
Revenue From Contract With Customer [Line Items] |  |  |
Contract drilling services | $ 2,785,557 | $ 2,474,458 | $ 1,792,476
Capitalized fulfillment costs | $ 13,900 |  |
Period of unsatisfied performance obligations represented in backlog contracts with month-to-month terms | month | 1 |  |
Accounts receivable payment period | 30 days |  |
Contract Drilling - Early Termination |  |  |
Revenue From Contract With Customer [Line Items] |  |  |
Contract drilling services | $ 11,300 | $ 17,100 | $ 29,400

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- 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. + References No definition available. + Details
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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. + References No definition available. + Details
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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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