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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Schedule of Financial Information of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Revenues	$ (1,040,924)	$ (697,724)	$ (2,734,265)	$ (2,062,814)
Segment operating income (loss)	(128,269)	113,457	4,780	349,862
Intersegment
Segment Reporting Information [Line Items]
Revenues	21,768	14,677	64,751	45,649
Segment operating income (loss)	6,114	(616)	(2,247)	(1,054)
Operating Segments
Segment Reporting Information [Line Items]
Revenues	(1,040,924)	(697,724)	(2,734,265)	(2,062,814)
Segment operating income (loss)	(63,985)	160,262	202,620	468,649
North America Solutions
Segment Reporting Information [Line Items]
Revenues	(591,976)	(620,040)	(1,789,350)	(1,827,661)
North America Solutions | Intersegment
Segment Reporting Information [Line Items]
Revenues	238	0	703	0
North America Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	(592,214)	(620,040)	(1,790,053)	(1,827,661)
Segment operating income (loss)	157,649	163,407	461,803	455,030
International Solutions
Segment Reporting Information [Line Items]
Revenues	(265,099)	(47,882)	(560,319)	(148,512)
International Solutions | Intersegment
Segment Reporting Information [Line Items]
Revenues	704	0	873	0
International Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	(265,803)	(47,882)	(561,192)	(148,512)
Segment operating income (loss)	(166,513)	(2,748)	(215,980)	8,606
Offshore Solutions
Segment Reporting Information [Line Items]
Revenues	(161,777)	(27,218)	(340,067)	(78,662)
Offshore Solutions | Intersegment
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Offshore Solutions | Operating Segments
Segment Reporting Information [Line Items]
Revenues	(161,777)	(27,218)	(340,067)	(78,662)
Segment operating income (loss)	8,769	5,010	29,649	8,140
Other
Segment Reporting Information [Line Items]
Revenues	(22,072)	(2,584)	(44,529)	(7,979)
Other | Intersegment
Segment Reporting Information [Line Items]
Revenues	20,826	14,677	63,175	45,649
Other | Operating Segments
Segment Reporting Information [Line Items]
Revenues	(42,898)	(17,261)	(107,704)	(53,628)
Segment operating income (loss)	$ (70,004)	$ (4,791)	$ (70,605)	$ (2,073)

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