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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Schedule of Financial Information of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Revenues	$ 687,943	$ 769,222	$ 1,365,090	$ 1,488,859
Segment operating income	110,572	175,205	234,040	319,428
Intersegment
Segment Reporting Information [Line Items]
Revenues	(15,746)	(17,662)	(30,972)	(34,064)
Segment operating income	(772)	(2,267)	(438)	43
Operating Segments
Segment Reporting Information [Line Items]
Revenues	687,943	769,222	1,365,090	1,488,859
Segment operating income	152,790	197,347	306,022	357,951
North America Solutions
Segment Reporting Information [Line Items]
Revenues	613,339	675,780	1,207,621	1,302,943
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	613,339	675,780	1,207,621	1,302,943
Segment operating income	147,130	182,149	291,620	327,446
Offshore Gulf of Mexico
Segment Reporting Information [Line Items]
Revenues	45,878	55,890	100,630	110,691
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	45,878	55,890	100,630	110,691
Segment operating income	3,569	3,955	8,992	5,529
International Solutions
Segment Reporting Information [Line Items]
Revenues	25,913	34,979	51,444	70,143
International Solutions | Intersegment
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
International Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	25,913	34,979	51,444	70,143
Segment operating income	78	6,687	3,130	13,433
Other
Segment Reporting Information [Line Items]
Revenues	2,813	2,573	5,395	5,082
Other | Intersegment
Segment Reporting Information [Line Items]
Revenues	(15,746)	(17,662)	(30,972)	(34,064)
Other | Operating Segments
Segment Reporting Information [Line Items]
Revenues	18,559	20,235	36,367	39,146
Segment operating income	$ 2,785	$ 6,823	$ 2,718	$ 11,500

X

- Definition

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

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