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DEBT - Unsecured Long-Term Debt Outstanding (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023
Long-term debt
Face Amount	$ 1,800,000	$ 550,000
Unamortized Discount and Debt Issuance Cost	(17,818)	(4,856)
Long-term debt, net	1,782,182	545,144
Unsecured Senior Notes due Due December 1, 2027
Long-term debt, gross
Face Amount	350,000	0
Unamortized Discount and Debt Issuance Cost	(2,907)	0
Book Value	347,093	0
Unsecured Senior Notes due Due December 1, 2029
Long-term debt, gross
Face Amount	350,000	0
Unamortized Discount and Debt Issuance Cost	(3,703)	0
Book Value	346,297	0
Unsecured Senior Notes due September 29, 2031
Long-term debt, gross
Face Amount	550,000	550,000
Unamortized Discount and Debt Issuance Cost	(4,262)	(4,856)
Book Value	545,738	545,144
Unsecured Senior Notes due Due December 1, 2034
Long-term debt, gross
Face Amount	550,000	0
Unamortized Discount and Debt Issuance Cost	(6,946)	0
Book Value	$ 543,054	$ 0

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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