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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Summary of Financial Information of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 332,213	$ 317,364	$ 874,761	$ 1,565,660
Segment operating income (loss)	(77,367)	(57,584)	(331,513)	(544,757)
North America Solutions
Segment Reporting Information [Line Items]
Revenues	281,132	254,434	733,061	1,325,076
Offshore Gulf of Mexico
Segment Reporting Information [Line Items]
Revenues	33,364	37,494	94,911	110,828
International Solutions
Segment Reporting Information [Line Items]
Revenues	15,278	22,477	40,609	120,189
Other
Segment Reporting Information [Line Items]
Revenues	2,439	2,959	6,180	9,567
Intersegment
Segment Reporting Information [Line Items]
Revenues	(9,379)	(10,384)	(25,181)	(28,927)
Segment operating income (loss)	(3,298)	0	(8,857)	0
Intersegment | North America Solutions
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Intersegment | Offshore Gulf of Mexico
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Intersegment | International Solutions
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Intersegment | Other
Segment Reporting Information [Line Items]
Revenues	(9,379)	(10,384)	(25,181)	(28,927)
Operating Segment
Segment Reporting Information [Line Items]
Revenues	332,213	317,364	874,761	1,565,660
Segment operating income (loss)	(49,542)	(27,295)	(240,919)	(464,873)
Operating Segment | North America Solutions
Segment Reporting Information [Line Items]
Revenues	281,132	254,434	733,061	1,325,076
Segment operating income (loss)	(43,743)	(25,157)	(226,505)	(315,705)
Operating Segment | Offshore Gulf of Mexico
Segment Reporting Information [Line Items]
Revenues	33,364	37,494	94,911	110,828
Segment operating income (loss)	5,707	3,013	11,427	6,022
Operating Segment | International Solutions
Segment Reporting Information [Line Items]
Revenues	15,278	22,477	40,609	120,189
Segment operating income (loss)	(3,538)	(9,540)	(15,353)	(158,894)
Operating Segment | Other
Segment Reporting Information [Line Items]
Revenues	11,818	13,343	31,361	38,494
Segment operating income (loss)	$ (4,670)	$ 4,389	$ (1,631)	$ 3,704

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The net result for the period of deducting operating expenses from operating revenues.

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