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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Income by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Operating revenues	$ 687,974	$ 648,872	$ 2,149,440	$ 1,790,443
Segment Operating Income (Loss)	(147,691)	35,225	48,855	89,726
U.S. Land
Segment Reporting Information [Line Items]
Operating revenues	593,297	537,181	1,842,054	1,481,585
Segment Operating Income (Loss)	(138,205)	34,339	47,602	86,159
Offshore
Segment Reporting Information [Line Items]
Operating revenues	37,674	37,669	109,167	104,018
Segment Operating Income (Loss)	5,078	3,780	16,778	17,954
International Land
Segment Reporting Information [Line Items]
Operating revenues	46,283	63,297	163,378	178,970
Segment Operating Income (Loss)	(5,023)	4,332	9,575	7,171
H&P Technologies
Segment Reporting Information [Line Items]
Operating revenues	9,376	7,693	29,353	16,842
Segment Operating Income (Loss)	(8,810)	(9,052)	(27,088)	(26,400)
Other
Segment Reporting Information [Line Items]
Operating revenues	3,194	3,934	9,665	10,437
Segment Operating Income (Loss)	(731)	1,826	1,988	4,842
Operating Segment
Segment Reporting Information [Line Items]
Operating revenues	687,974	648,872	2,149,440	1,790,443
Operating Segment | U.S. Land
Segment Reporting Information [Line Items]
Operating revenues	593,297	536,582	1,842,054	1,480,951
Operating Segment | U.S. Land | Technology
Segment Reporting Information [Line Items]
Operating revenues	9,100		20,900
Operating Segment | Offshore
Segment Reporting Information [Line Items]
Operating revenues	37,674	37,669	109,167	104,018
Operating Segment | International Land
Segment Reporting Information [Line Items]
Operating revenues	46,283	63,297	163,378	178,970
Operating Segment | H&P Technologies
Segment Reporting Information [Line Items]
Operating revenues	7,534	7,693	25,199	16,842
Operating Segment | H&P Technologies | Technology
Segment Reporting Information [Line Items]
Operating revenues	1,800		4,200
Operating Segment | Other
Segment Reporting Information [Line Items]
Operating revenues	3,186	3,631	9,642	9,662
Inter-Segment
Segment Reporting Information [Line Items]
Operating revenues	(1,850)	(902)	(4,177)	(1,409)
Inter-Segment | U.S. Land
Segment Reporting Information [Line Items]
Operating revenues	0	599	0	634
Inter-Segment | Offshore
Segment Reporting Information [Line Items]
Operating revenues	0	0	0	0
Inter-Segment | International Land
Segment Reporting Information [Line Items]
Operating revenues	0	0	0	0
Inter-Segment | H&P Technologies
Segment Reporting Information [Line Items]
Operating revenues	1,842	0	4,154	0
Inter-Segment | Other
Segment Reporting Information [Line Items]
Operating revenues	$ 8	$ 303	$ 23	$ 775

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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-Publisher FASB
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-Topic 606
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