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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Total Assets by Reportable Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Assets	$ 5,176,754	$ 5,839,515
Continuing Operations
Segment Reporting Information [Line Items]
Assets	5,176,754	5,839,515
Discontinued Operations
Segment Reporting Information [Line Items]
Assets	0	0
Operating Segment
Segment Reporting Information [Line Items]
Assets	4,642,816	5,636,209
Investments and Corporate Operations
Segment Reporting Information [Line Items]
Assets	533,938	203,306
U.S. Land | Operating Segment
Segment Reporting Information [Line Items]
Assets	4,158,450	5,099,583
Offshore | Operating Segment
Segment Reporting Information [Line Items]
Assets	111,116	102,442
International Land | Operating Segment
Segment Reporting Information [Line Items]
Assets	179,170	217,094
H&P Technologies | Operating Segment
Segment Reporting Information [Line Items]
Assets	151,577	184,558
Other | Operating Segment
Segment Reporting Information [Line Items]
Assets	$ 42,503	$ 32,532

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Section 50
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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