v3.26.1
DEBT - Schedule of Unsecured Long-Term Debt Outstanding (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Sep. 30, 2025
Long-term debt, gross    
Face Amount $ 1,877,735 $ 2,082,880
Unamortized Discount and Debt Issuance Cost (15,619) (18,937)
Book Value 1,862,116 2,063,943
Less: current portion of long-term debt    
Face Amount (6,859) (6,859)
Unamortized Discount and Debt Issuance Cost 0 0
2024 Oman Facility (6,859) (6,859)
Total long-term debt, net    
Face Amount 1,870,876 2,076,021
Unamortized Discount and Debt Issuance Cost (15,619) (18,937)
Long-term debt, net 1,855,257 2,057,084
Unsecured Debt    
Long-term debt, gross    
Face Amount 1,800,000 1,800,000
Unamortized Discount and Debt Issuance Cost (13,980) (16,191)
Book Value 1,786,020 1,783,809
Secured Debt    
Long-term debt, gross    
Face Amount 77,735 82,880
Unamortized Discount and Debt Issuance Cost (1,639) (1,766)
Book Value 76,096 81,114
Due December 1, 2027    
Long-term debt, gross    
Face Amount 350,000 350,000
Unamortized Discount and Debt Issuance Cost (1,554) (2,326)
Book Value 348,446 347,674
Total long-term debt, net    
Long-term debt, net 348,446 347,675
Due December 1, 2029    
Long-term debt, gross    
Face Amount 350,000 350,000
Unamortized Discount and Debt Issuance Cost (2,842) (3,398)
Book Value 347,158 346,602
Total long-term debt, net    
Long-term debt, net 347,158 346,602
Due September 29, 2031    
Long-term debt, gross    
Face Amount 550,000 550,000
Unamortized Discount and Debt Issuance Cost (3,213) (3,664)
Book Value 546,787 546,336
Total long-term debt, net    
Long-term debt, net 546,787 546,336
Due December 1, 2034    
Long-term debt, gross    
Face Amount 550,000 550,000
Unamortized Discount and Debt Issuance Cost (6,371) (6,803)
Book Value 543,629 543,197
Total long-term debt, net    
Long-term debt, net 543,629 543,197
Due January 15, 2027    
Long-term debt, gross    
Face Amount 0 200,000
Unamortized Discount and Debt Issuance Cost 0 (980)
Book Value 0 199,020
Total long-term debt, net    
Long-term debt, net   199,020
Due December 31, 2033    
Long-term debt, gross    
Face Amount 37,212 39,789
Unamortized Discount and Debt Issuance Cost (807) (888)
Book Value 36,405 38,901
Due December 31, 2034    
Long-term debt, gross    
Face Amount 40,523 43,091
Unamortized Discount and Debt Issuance Cost (832) (878)
Book Value $ 39,691 $ 42,213