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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Summary of Financial Information of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 633,639	$ 720,868	$ 1,248,296	$ 1,461,466
Segment Operating Income (Loss)	(518,541)	95,146	(487,173)	149,435
U.S. Land
Segment Reporting Information [Line Items]
Revenues	530,664	617,533	1,039,492	1,236,958
Offshore
Segment Reporting Information [Line Items]
Revenues	33,079	34,583	73,334	71,493
International Land
Segment Reporting Information [Line Items]
Revenues	51,250	50,808	97,712	117,095
H&P Technologies
Segment Reporting Information [Line Items]
Revenues	15,297	14,729	31,150	29,465
Other
Segment Reporting Information [Line Items]
Revenues	3,349	3,215	6,608	6,455
Operating Segment
Segment Reporting Information [Line Items]
Revenues	633,639	720,868	1,248,296	1,461,466
Segment Operating Income (Loss)	(498,079)	111,870	(437,578)	196,545
Operating Segment | U.S. Land
Segment Reporting Information [Line Items]
Revenues	530,664	617,533	1,039,492	1,236,958
Segment Operating Income (Loss)	(309,093)	102,015	(252,403)	177,928
Operating Segment | Offshore
Segment Reporting Information [Line Items]
Revenues	33,079	34,583	73,334	71,493
Segment Operating Income (Loss)	(3,319)	4,531	3,009	11,699
Operating Segment | International Land
Segment Reporting Information [Line Items]
Revenues	51,250	50,808	97,712	117,095
Segment Operating Income (Loss)	(152,469)	7,968	(149,354)	14,597
Operating Segment | H&P Technologies
Segment Reporting Information [Line Items]
Revenues	17,709	14,729	36,261	29,465
Segment Operating Income (Loss)	(33,574)	(3,808)	(38,125)	(10,397)
Operating Segment | Other
Segment Reporting Information [Line Items]
Revenues	13,998	3,215	25,153	6,455
Segment Operating Income (Loss)	376	1,164	(705)	2,718
Intersegment
Segment Reporting Information [Line Items]
Revenues	(13,061)	0	(23,656)	0
Segment Operating Income (Loss)	0	0	0	0
Intersegment | U.S. Land
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Intersegment | Offshore
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Intersegment | International Land
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Intersegment | H&P Technologies
Segment Reporting Information [Line Items]
Revenues	2,412	0	5,111	0
Intersegment | Other
Segment Reporting Information [Line Items]
Revenues	$ 10,649	$ 0	$ 18,545	$ 0

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Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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