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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Summary of Financial Information of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 677,147	$ 719,637
Segment operating income	123,468	144,223
Intersegment
Segment Reporting Information [Line Items]
Revenues	(15,226)	(16,402)
Segment operating income	334	2,310
Operating Segments
Segment Reporting Information [Line Items]
Revenues	677,147	719,637
Segment operating income	153,232	160,604
North America Solutions
Segment Reporting Information [Line Items]
Revenues	594,282	627,163
North America Solutions | Intersegment
Segment Reporting Information [Line Items]
Revenues	0	0
North America Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	594,282	627,163
Segment operating income	144,490	145,297
Offshore Gulf of Mexico
Segment Reporting Information [Line Items]
Revenues	25,531	35,164
Offshore Gulf of Mexico | Intersegment
Segment Reporting Information [Line Items]
Revenues	0	0
Offshore Gulf of Mexico | Operating Segments
Segment Reporting Information [Line Items]
Revenues	25,531	35,164
Segment operating income	3,052	6,746
International Solutions
Segment Reporting Information [Line Items]
Revenues	54,752	54,801
International Solutions | Intersegment
Segment Reporting Information [Line Items]
Revenues	0	0
International Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	54,752	54,801
Segment operating income	5,423	1,574
Other
Segment Reporting Information [Line Items]
Revenues	2,582	2,509
Other | Intersegment
Segment Reporting Information [Line Items]
Revenues	(15,226)	(16,402)
Other | Operating Segments
Segment Reporting Information [Line Items]
Revenues	17,808	18,911
Segment operating income	$ (67)	$ 4,677

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

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