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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Schedule of Revenues from External Customers and Long-Lived Assets by Country (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Operating revenues	$ 677,302	$ 677,147
United States
Segment Reporting Information [Line Items]
Operating revenues	628,680	621,617
Argentina
Segment Reporting Information [Line Items]
Operating revenues	34,660	35,876
Bahrain
Segment Reporting Information [Line Items]
Operating revenues	4,848	4,497
Australia
Segment Reporting Information [Line Items]
Operating revenues	4,757	4,312
Saudi Arabia
Segment Reporting Information [Line Items]
Operating revenues	3,231	0
Colombia
Segment Reporting Information [Line Items]
Operating revenues	0	7,703
United Arab Emirates
Segment Reporting Information [Line Items]
Operating revenues	0	2,365
Other foreign
Segment Reporting Information [Line Items]
Operating revenues	$ 1,126	$ 777

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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