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DEBT - Unsecured Long-Term Debt Outstanding (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Long-term debt, gross |  |
Long-term debt | $ 1,037,148 | $ 487,148
Unamortized Discount and Debt Issuance Cost | (11,665) | (6,421)
Book Value | 1,025,483 | 480,727
Less: long-term debt due within one year |  |
Face Amount | (487,148) | 0
Unamortized Discount and Debt Issuance Cost | 3,662 | 0
Current portion of long-term debt | (483,486) | 0
Long-term debt |  |
Face Amount | 550,000 | 487,148
Unamortized Discount and Debt Issuance Cost | (8,003) | (6,421)
Long-term debt, net | 541,997 | 480,727
Unsecured Senior Notes due March 19, 2025 |  |
Long-term debt, gross |  |
Long-term debt |  | 487,148
Unamortized Discount and Debt Issuance Cost | (3,662) | (6,421)
Book Value | 483,486 | 480,727
Unsecured Senior Notes due September 29, 2031 |  |
Long-term debt, gross |  |
Long-term debt | 550,000 | 0
Unamortized Discount and Debt Issuance Cost | (8,003) | 0
Book Value | $ 541,997 | $ 0

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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