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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Schedule of Financial Information of Reportable Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Revenues	$ 2,872,421	$ 2,058,944	$ 1,218,568
Segment operating income (loss)	561,889	45,292	(428,549)
Depreciation and amortization	382,314	403,170	419,726
Intersegment
Segment Reporting Information [Line Items]
Revenues	(67,428)	(57,047)	(35,416)
Segment operating income (loss)	4,671	(6,422)	(1,580)
Operating Segments
Segment Reporting Information [Line Items]
Revenues	2,872,421	2,058,944	1,218,568
Segment operating income (loss)	667,929	151,267	(303,494)
Depreciation and amortization	371,227	390,282	406,411
North America Solutions
Segment Reporting Information [Line Items]
Revenues	2,519,743	1,788,167	1,026,364
North America Solutions | Intersegment
Segment Reporting Information [Line Items]
Revenues	0	0	0
North America Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	2,519,743	1,788,167	1,026,364
Segment operating income (loss)	625,467	121,893	(287,176)
Depreciation and amortization	353,976	375,250	392,415
Offshore Gulf of Mexico
Segment Reporting Information [Line Items]
Revenues	130,244	125,465	126,399
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	130,244	125,465	126,399
Segment operating income (loss)	22,806	23,214	15,969
Depreciation and amortization	7,622	9,175	10,557
International Solutions
Segment Reporting Information [Line Items]
Revenues	212,566	136,072	57,917
International Solutions | Intersegment
Segment Reporting Information [Line Items]
Revenues	0	0	0
International Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	212,566	136,072	57,917
Segment operating income (loss)	(891)	(138)	(21,003)
Depreciation and amortization	7,615	4,156	2,013
Other
Segment Reporting Information [Line Items]
Revenues	9,868	9,240	7,888
Other | Intersegment
Segment Reporting Information [Line Items]
Revenues	(67,428)	(57,047)	(35,416)
Other | Operating Segments
Segment Reporting Information [Line Items]
Revenues	77,296	66,287	43,304
Segment operating income (loss)	15,876	12,720	(9,704)
Depreciation and amortization	$ 2,014	$ 1,701	$ 1,426

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