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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Revenues from External Customers by Country (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenues	$ 332,213	$ 317,364	$ 874,761	$ 1,565,660
United States
Segment Reporting Information [Line Items]
Revenues	316,315	294,335	832,516	1,442,670
Argentina
Segment Reporting Information [Line Items]
Revenues	7,999	7,231	16,532	77,522
Bahrain
Segment Reporting Information [Line Items]
Revenues	6,979	6,430	21,449	21,497
United Arab Emirates
Segment Reporting Information [Line Items]
Revenues	0	8,403	990	14,857
Colombia
Segment Reporting Information [Line Items]
Revenues	300	413	1,674	6,313
Other Foreign
Segment Reporting Information [Line Items]
Revenues	$ 620	$ 552	$ 1,600	$ 2,801

X

- Definition

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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