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DEBT - Schedule of Unsecured Long-Term Debt Outstanding (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Long-term debt, gross
Face Amount	$ 2,211,594	$ 1,800,000
Unamortized Discount and Debt Issuance Cost	(19,899)	(17,818)
Book Value	2,191,695	1,782,182
Less: current portion of long-term debt
Face Amount	(6,859)	0
Unamortized Discount and Debt Issuance Cost	0	0
2024 Oman Facility1	(6,859)	0
Total long-term debt, net
Face Amount	2,204,735	1,800,000
Unamortized Discount and Debt Issuance Cost	(19,899)	(17,818)
Long-term debt, net	2,184,836	1,782,182
Unsecured Debt
Long-term debt, gross
Face Amount	1,800,000	1,800,000
Unamortized Discount and Debt Issuance Cost	(16,912)	(17,818)
Book Value	1,783,088	1,782,182
Secured Debt
Long-term debt, gross
Face Amount	84,594	0
Unamortized Discount and Debt Issuance Cost	(1,816)	0
Book Value	82,778	0
Due December 1, 2027
Long-term debt, gross
Face Amount	350,000	350,000
Unamortized Discount and Debt Issuance Cost	(2,576)	(2,907)
Book Value	347,424	347,093
Total long-term debt, net
Long-term debt, net	347,424	347,093
Due December 1, 2029
Long-term debt, gross
Face Amount	350,000	350,000
Unamortized Discount and Debt Issuance Cost	(3,579)	(3,703)
Book Value	346,421	346,297
Total long-term debt, net
Long-term debt, net	346,421	346,297
Due September 29, 2031
Long-term debt, gross
Face Amount	550,000	550,000
Unamortized Discount and Debt Issuance Cost	(3,814)	(4,262)
Book Value	546,186	545,738
Total long-term debt, net
Long-term debt, net	546,186	545,738
Due December 1, 2034
Long-term debt, gross
Face Amount	550,000	550,000
Unamortized Discount and Debt Issuance Cost	(6,943)	(6,946)
Book Value	543,057	543,054
Total long-term debt, net
Long-term debt, net	543,057	543,054
Due January 15, 2027
Long-term debt, gross
Face Amount	327,000	0
Unamortized Discount and Debt Issuance Cost	(1,171)	0
Book Value	325,829	0
Total long-term debt, net
Long-term debt, net	325,829
Due December 31, 2033
Long-term debt, gross
Face Amount	40,647	0
Unamortized Discount and Debt Issuance Cost	(915)	0
Book Value	39,732	0
Due December 31, 2034
Long-term debt, gross
Face Amount	43,947	0
Unamortized Discount and Debt Issuance Cost	(901)	0
Book Value	$ 43,046	$ 0

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