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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) month | Jun. 30, 2018 USD ($)
Revenue from Contract with Customer [Abstract] |  |  |  |
Early termination revenue | $ 0.8 | $ 6.0 | $ 9.1 | $ 14.3
Capitalized cost | $ 15.9 |  | $ 15.9 |
Number of months of unsatisfied performance obligations represent in our backlog relating to contract that currently contain month-to-month terms | month |  |  | 1 |

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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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