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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - International Land Drilling Risks (Details) $ in Millions	3 Months Ended
	Dec. 31, 2018 USD ($) item	Dec. 31, 2017 USD ($)
Risk or uncertainty
Cumulative inflation rate before a country is considered highly inflationary (as a percent)	100.00%
Period for which cumulative inflation rates used for considering country as highly inflationary	3 years
Foreign currency losses | $	$ 3.9	$ 1.5
Minimum
Risk or uncertainty
Number Of Geographical Areas Of Operation To Minimize Risks | item	1

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Represents the cumulative inflation rate before a country is considered highly inflationary.

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Represents the number of geographical areas operated to minimize the potential impact of risks.

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Represents the period over which cumulative inflation rates are used in considering whether a country is highly inflationary.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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