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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Total assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Assets	$ 5,897,379	$ 6,214,867
Operating Segment
Segment Reporting Information [Line Items]
Assets	5,342,234	5,656,332
Investments and Corporate Operations
Segment Reporting Information [Line Items]
Assets	555,145	558,535
U.S. Land | Operating Segment
Segment Reporting Information [Line Items]
Assets	4,742,605	5,012,378
Offshore | Operating Segment
Segment Reporting Information [Line Items]
Assets	100,490	105,439
International Land | Operating Segment
Segment Reporting Information [Line Items]
Assets	318,195	362,033
H&P Technologies | Operating Segment
Segment Reporting Information [Line Items]
Assets	149,712	146,957
Other | Operating Segment
Segment Reporting Information [Line Items]
Assets	31,232	29,525
Continued operations
Segment Reporting Information [Line Items]
Assets	5,897,379	6,214,867
Discontinued operations
Segment Reporting Information [Line Items]
Assets	$ 0	$ 0

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(11))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(12))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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+ References

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