BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Summary of Financial Information of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 769,222	$ 467,597	$ 1,488,859	$ 877,379
Segment operating income (loss)	175,205	(22,617)	319,428	(65,228)
Intersegment
Segment Reporting Information [Line Items]
Revenues	(17,662)	(13,204)	(34,064)	(26,852)
Segment operating income (loss)	(2,267)	(2,031)	43	(3,313)
Operating Segments
Segment Reporting Information [Line Items]
Revenues	769,222	467,597	1,488,859	877,379
Segment operating income (loss)	197,347	6,863	357,951	(5,868)
North America Solutions
Segment Reporting Information [Line Items]
Revenues	675,780	408,814	1,302,943	749,848
North America Solutions | Intersegment
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
North America Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	675,780	408,814	1,302,943	749,848
Segment operating income (loss)	182,149	1,297	327,446	(27,596)
Offshore Gulf of Mexico
Segment Reporting Information [Line Items]
Revenues	34,979	29,147	70,143	58,461
Offshore Gulf of Mexico | Intersegment
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Offshore Gulf of Mexico | Operating Segments
Segment Reporting Information [Line Items]
Revenues	34,979	29,147	70,143	58,461
Segment operating income (loss)	6,687	5,278	13,433	10,744
International Solutions
Segment Reporting Information [Line Items]
Revenues	55,890	27,422	110,691	64,581
International Solutions | Intersegment
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
International Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	55,890	27,422	110,691	64,581
Segment operating income (loss)	3,955	(848)	5,529	7,201
Other
Segment Reporting Information [Line Items]
Revenues	2,573	2,214	5,082	4,489
Other | Intersegment
Segment Reporting Information [Line Items]
Revenues	(17,662)	(13,204)	(34,064)	(26,852)
Other | Operating Segments
Segment Reporting Information [Line Items]
Revenues	20,235	15,418	39,146	31,341
Segment operating income (loss)	$ 6,823	$ 3,167	$ 11,500	$ 7,096