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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

X

- Definition

Revenue related to early termination of contract.

+ References

No definition available.

+ Details

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X

- 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.

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X

- 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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- References

No definition available.

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