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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Summary of Financial Information of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 614,657	$ 740,598
Segment Operating Income (Loss)	31,368	54,289
U.S. Land
Segment Reporting Information [Line Items]
Revenues	508,828	619,425
Offshore
Segment Reporting Information [Line Items]
Revenues	40,255	36,910
International Land
Segment Reporting Information [Line Items]
Revenues	46,462	66,287
H&P Technologies
Segment Reporting Information [Line Items]
Revenues	15,853	14,736
Other
Segment Reporting Information [Line Items]
Revenues	3,259	3,240
Operating Segment
Segment Reporting Information [Line Items]
Revenues	614,657	740,598
Segment Operating Income (Loss)	60,345	84,719
Operating Segment | U.S. Land
Segment Reporting Information [Line Items]
Revenues	508,828	619,425
Segment Operating Income (Loss)	56,690	75,748
Operating Segment | Offshore
Segment Reporting Information [Line Items]
Revenues	40,255	36,910
Segment Operating Income (Loss)	6,328	7,168
Operating Segment | International Land
Segment Reporting Information [Line Items]
Revenues	46,462	66,287
Segment Operating Income (Loss)	3,115	6,630
Operating Segment | H&P Technologies
Segment Reporting Information [Line Items]
Revenues	18,552	14,736
Segment Operating Income (Loss)	(4,551)	(6,381)
Operating Segment | Other
Segment Reporting Information [Line Items]
Revenues	10,999	3,240
Segment Operating Income (Loss)	(1,237)	1,554
Intersegment
Segment Reporting Information [Line Items]
Revenues	(10,439)	0
Segment Operating Income (Loss)		0
Intersegment | U.S. Land
Segment Reporting Information [Line Items]
Revenues	0	0
Intersegment | Offshore
Segment Reporting Information [Line Items]
Revenues	0	0
Intersegment | International Land
Segment Reporting Information [Line Items]
Revenues	0	0
Intersegment | H&P Technologies
Segment Reporting Information [Line Items]
Revenues	2,699	0
Intersegment | Other
Segment Reporting Information [Line Items]
Revenues	$ 7,740	$ 0

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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-Paragraph 32
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-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8933-108599

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(1))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

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