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DEBT - Unsecured Long-Term Debt Outstanding (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Long-term debt, gross
Face Amount	$ 550,000	$ 550,000
Unamortized Discount and Debt Issuance Cost	(5,004)	(7,390)
Book Value	544,996	542,610
Less: long-term debt due within one year
Face Amount	0	0
Unamortized Discount and Debt Issuance Cost	0	0
Current portion of long-term debt, net	0	0
Long-term debt
Face Amount	550,000	550,000
Unamortized Discount and Debt Issuance Cost	(5,004)	(7,390)
Long-term debt, net	544,996	542,610
Unsecured Senior Notes due September 29, 2031
Long-term debt, gross
Face Amount	550,000	550,000
Unamortized Discount and Debt Issuance Cost	(5,004)	(7,390)
Book Value	$ 544,996	$ 542,610

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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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