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DEBT (Tables)
12 Months Ended
Sep. 30, 2021
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:
September 30, 2021September 30, 2020
(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 March 15, 20251
$487,148 $(3,662)$483,486 $487,148 $(6,421)$480,727 
Due September 29, 2031550,000 (8,003)541,997 — — — 
Total notes payable1,037,148 (11,665)1,025,483 487,148 (6,421)480,727 
Less: long-term debt due within one year$(487,148)3,662 (483,486)— — — 
Long-term debt$550,000 $(8,003)$541,997 $487,148 $(6,421)$480,727 
(1) Debt was extinguished prior to maturity date. Refer to 'Senior Notes' section below.
Schedule of Aggregate Maturities of Long-Term Debt
At September 30, 2021, aggregate maturities of long-term debt are as follows (in thousands):
Year ending September 30,    
2022$— 
2023— 
2024— 
2025— 
2026— 
Thereafter - Due 2031550,000 
$550,000