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DEBT (Tables)
6 Months Ended
Mar. 31, 2023
Debt Disclosure [Abstract]  
Schedule of Components of Unsecured Long-Term Debt Outstanding
We had the following unsecured long-term debt outstanding with maturities shown in the following table:
March 31, 2023September 30, 2022
(in thousands)Face Amount    Unamortized Discount and Debt Issuance Cost    Book Value    Face Amount    Unamortized Discount and Debt Issuance Cost    Book Value
Unsecured senior notes:
Due September 29, 2031$550,000 $(7,266)$542,734 $550,000 $(7,390)$542,610 
550,000 (7,266)542,734 550,000 (7,390)542,610 
Less: long-term debt due within one year— — — — — — 
Long-term debt$550,000 $(7,266)$542,734 $550,000 $(7,390)$542,610