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DEBT - Components of Unsecured Long-Term Debt Outstanding (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019
Long-term debt, gross
Face Amount	$ 487,148	$ 487,148
Unamortized Discount and Debt Issuance Cost	(7,793)	(7,792)
Book Value	479,355	479,356
Less long-term debt due within one year
Face Amount	0	0
Unamortized Discount and Debt Issuance Cost	0	0
Book Value	0	0
Long-term debt
Face Amount	487,148	487,148
Unamortized Discount and Debt Issuance Cost	(7,793)	(7,792)
Book Value	479,355	479,356
HPIDC 2025 Notes
Long-term debt, gross
Face Amount	487,148	487,148
Unamortized Discount and Debt Issuance Cost	(7,793)	(7,792)
Book Value	479,355	479,356
Long-term debt
Face Amount	$ 487,148	$ 487,148

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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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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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