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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, 2025
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]      
Operating revenues $ 3,746,013 $ 2,756,607 $ 2,872,421
Property, plant and equipment, net 4,313,074 3,016,277  
United States      
Segment Reporting Information [Line Items]      
Operating revenues 2,481,593 2,558,814 2,656,617
Property, plant and equipment, net 2,503,045 2,752,325  
Saudi Arabia      
Segment Reporting Information [Line Items]      
Operating revenues 261,747 0 0
Property, plant and equipment, net 971,440 149,472  
Norway      
Segment Reporting Information [Line Items]      
Operating revenues 220,263 0 0
Property, plant and equipment, net 25,431 0  
Oman      
Segment Reporting Information [Line Items]      
Operating revenues 179,568 0 0
Property, plant and equipment, net 445,706 0  
United Kingdom      
Segment Reporting Information [Line Items]      
Property, plant and equipment, net 71,385 0  
Argentina      
Segment Reporting Information [Line Items]      
Operating revenues 155,727 142,451 137,420
Property, plant and equipment, net 71,135 62,533  
Azerbaijan      
Segment Reporting Information [Line Items]      
Operating revenues 129,011 0 0
Germany      
Segment Reporting Information [Line Items]      
Operating revenues 57,561 0 0
Property, plant and equipment, net 51,306 0  
Colombia      
Segment Reporting Information [Line Items]      
Operating revenues 36,058 9,254 46,720
Property, plant and equipment, net 36,723 19,243  
Kuwait      
Segment Reporting Information [Line Items]      
Operating revenues 30,653 0 0
Property, plant and equipment, net 40,760 0  
Bahrain      
Segment Reporting Information [Line Items]      
Operating revenues 30,816 17,990 15,401
Other foreign      
Segment Reporting Information [Line Items]      
Operating revenues 163,016 28,098 $ 16,263
Property, plant and equipment, net $ 96,143 $ 32,704