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DEBT - Schedule of Unsecured Long-Term Debt Outstanding (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | ---
Long-term debt |  |
Face Amount | $ 1,800,000 | $ 1,800,000
Unamortized Discount and Debt Issuance Cost | (18,326) | (17,818)
Long-term debt, net | 1,781,674 | 1,782,182
Due December 1, 2027 |  |
Long-term debt, gross |  |
Face Amount | 350,000 | 350,000
Unamortized Discount and Debt Issuance Cost | (3,066) | (2,907)
Book Value | 346,934 | 347,093
Due December 1, 2029 |  |
Long-term debt, gross |  |
Face Amount | 350,000 | 350,000
Unamortized Discount and Debt Issuance Cost | (3,932) | (3,703)
Book Value | 346,068 | 346,297
Due September 29, 2031 |  |
Long-term debt, gross |  |
Face Amount | 550,000 | 550,000
Unamortized Discount and Debt Issuance Cost | (4,112) | (4,262)
Book Value | 545,888 | 545,738
Due December 1, 2034 |  |
Long-term debt, gross |  |
Face Amount | 550,000 | 550,000
Unamortized Discount and Debt Issuance Cost | (7,216) | (6,946)
Book Value | $ 542,784 | $ 543,054

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