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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, 2023
Sep. 30, 2022
Sep. 30, 2021
Segment Reporting Information [Line Items]      
Operating revenues $ 2,872,421 $ 2,058,944 $ 1,218,568
Property, plant and equipment, net 2,921,695 2,960,809  
United States      
Segment Reporting Information [Line Items]      
Operating revenues 2,656,617 1,920,026 1,158,230
Property, plant and equipment, net 2,813,707 2,872,145  
Argentina      
Segment Reporting Information [Line Items]      
Operating revenues 137,420 91,385 27,855
Property, plant and equipment, net 57,168 54,789  
Colombia      
Segment Reporting Information [Line Items]      
Operating revenues 46,720 22,003 1,674
Property, plant and equipment, net 20,835 21,809  
Bahrain      
Segment Reporting Information [Line Items]      
Operating revenues 15,401 16,986 27,435
United Arab Emirates      
Segment Reporting Information [Line Items]      
Operating revenues 9,716 5,698 957
Property, plant and equipment, net 10,373 3,024  
Australia      
Segment Reporting Information [Line Items]      
Operating revenues 3,350 0 0
Property, plant and equipment, net 10,673 0  
Other foreign      
Segment Reporting Information [Line Items]      
Operating revenues 3,197 2,846 $ 2,417
Property, plant and equipment, net $ 8,939 $ 9,042