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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, 2022
Sep. 30, 2021
Sep. 30, 2020
Segment Reporting Information [Line Items]      
Operating revenues $ 2,058,944 $ 1,218,568 $ 1,773,927
Property, plant and equipment, net 2,960,809 3,127,287  
United States      
Segment Reporting Information [Line Items]      
Operating revenues 1,920,026 1,158,230 1,626,407
Property, plant and equipment, net 2,872,145 3,042,140  
Argentina      
Segment Reporting Information [Line Items]      
Operating revenues 91,385 27,855 84,402
Property, plant and equipment, net 54,789 50,944  
Bahrain      
Segment Reporting Information [Line Items]      
Operating revenues 16,986 27,435 28,653
United Arab Emirates      
Segment Reporting Information [Line Items]      
Operating revenues 5,698 957 24,716
Colombia      
Segment Reporting Information [Line Items]      
Operating revenues 22,003 1,674 6,414
Property, plant and equipment, net 21,809 22,959  
Other foreign      
Segment Reporting Information [Line Items]      
Operating revenues 2,846 2,417 $ 3,335
Property, plant and equipment, net $ 12,066 $ 11,244