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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Summary of Financial Information of Reportable Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 2,058,944	$ 1,218,568	$ 1,773,927
Segment operating income (loss)	45,292	(428,549)	(620,187)
Depreciation and amortization	403,170	419,726	481,885
Intersegment
Segment Reporting Information [Line Items]
Revenues	(57,047)	(35,416)	(36,901)
Segment operating income (loss)	(6,422)	(1,580)
Operating Segments
Segment Reporting Information [Line Items]
Revenues	2,058,944	1,218,568	1,773,927
Segment operating income (loss)	151,267	(303,494)	(544,389)
Depreciation and amortization	390,282	406,411	468,492
North America Solutions
Segment Reporting Information [Line Items]
Revenues	1,788,167	1,026,364	1,474,380
North America Solutions | Intersegment
Segment Reporting Information [Line Items]
Revenues	0	0	0
North America Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	1,788,167	1,026,364	1,474,380
Segment operating income (loss)	121,893	(287,176)	(393,902)
Depreciation and amortization	375,250	392,415	438,039
Offshore Gulf of Mexico
Segment Reporting Information [Line Items]
Revenues	125,465	126,399	143,149
Offshore Gulf of Mexico | Intersegment
Segment Reporting Information [Line Items]
Revenues	0	0	0
Offshore Gulf of Mexico | Operating Segments
Segment Reporting Information [Line Items]
Revenues	125,465	126,399	143,149
Segment operating income (loss)	23,214	15,969	7,478
Depreciation and amortization	9,175	10,557	11,681
International Solutions
Segment Reporting Information [Line Items]
Revenues	136,072	57,917	144,185
International Solutions | Intersegment
Segment Reporting Information [Line Items]
Revenues	0	0	0
International Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	136,072	57,917	144,185
Segment operating income (loss)	(138)	(21,003)	(162,368)
Depreciation and amortization	4,156	2,013	17,531
Other
Segment Reporting Information [Line Items]
Revenues	9,240	7,888	12,213
Other | Intersegment
Segment Reporting Information [Line Items]
Revenues	(57,047)	(35,416)	(36,901)
Other | Operating Segments
Segment Reporting Information [Line Items]
Revenues	66,287	43,304	49,114
Segment operating income (loss)	12,720	(9,704)	4,403
Depreciation and amortization	$ 1,701	$ 1,426	$ 1,241

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