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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Schedule of Financial Information of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Revenues	$ 677,302	$ 677,147
Segment operating income (loss)	89,983	123,468
Intersegment
Segment Reporting Information [Line Items]
Revenues	(16,815)	(15,226)
Segment operating income (loss)	102	334
Operating Segments
Segment Reporting Information [Line Items]
Revenues	677,302	677,147
Segment operating income (loss)	141,205	153,232
North America Solutions
Segment Reporting Information [Line Items]
Revenues	597,923	594,282
North America Solutions | Intersegment
Segment Reporting Information [Line Items]
Revenues	(222)	0
North America Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	598,145	594,282
Segment operating income (loss)	151,994	144,490
International Solutions
Segment Reporting Information [Line Items]
Revenues	47,480	54,752
International Solutions | Intersegment
Segment Reporting Information [Line Items]
Revenues	0	0
International Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	47,480	54,752
Segment operating income (loss)	(15,170)	5,423
Offshore Gulf of Mexico
Segment Reporting Information [Line Items]
Revenues	29,210	25,531
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	29,210	25,531
Segment operating income (loss)	3,505	3,052
Other
Segment Reporting Information [Line Items]
Revenues	2,689	2,582
Other | Intersegment
Segment Reporting Information [Line Items]
Revenues	(16,593)	(15,226)
Other | Operating Segments
Segment Reporting Information [Line Items]
Revenues	19,282	17,808
Segment operating income (loss)	$ 774	$ (67)

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