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BUSINESS SEGMENTS AND GEOGRAPHIC INFORMATION - Revenues from External Customers and Long-Lived Assets by Country (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Operating revenues	$ 1,218,568	$ 1,773,927	$ 2,798,490
Property, plant and equipment, net	3,127,287	3,646,341
United States
Segment Reporting Information [Line Items]
Operating revenues	1,158,230	1,626,407	2,585,008
Property, plant and equipment, net	3,042,140	3,562,525
Argentina
Segment Reporting Information [Line Items]
Operating revenues	27,855	84,402	165,718
Property, plant and equipment, net	50,944	49,419
Bahrain
Segment Reporting Information [Line Items]
Operating revenues	27,435	28,653	11,528
United Arab Emirates
Segment Reporting Information [Line Items]
Operating revenues	957	24,716	4,728
Colombia
Segment Reporting Information [Line Items]
Operating revenues	1,674	6,414	29,757
Property, plant and equipment, net	22,959	21,740
Other foreign
Segment Reporting Information [Line Items]
Operating revenues	2,417	3,335	$ 1,751
Property, plant and equipment, net	$ 11,244	$ 12,657

X

- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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