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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)
12 Months Ended
Sep. 30, 2020
Fair Value Disclosures [Abstract]  
Fair value measurements on a recurring basis
The following table presents financial instruments, other than debt, that we measured at fair value on a recurring basis at September 30, 2020 and 2019.  See Note 13 of this Annual Report on Form 10-K for a discussion of our debt. In instances where the inputs used to measure the fair value of an asset fall into more than one level of the hierarchy, we have classified them based on the lowest level input that is significant to the determination of the fair value.
September 30, 2020Level 1Level 2Level 3Total
Fair Value
Assets:
Cash and cash equivalents$257,354 $— $— $257,354 
Other long-term investments1,214 — — 1,214 
Derivative financial instruments— 27 — 27 
Liabilities:
Derivative financial instruments$— $38,157 $— $38,157 

September 30, 2019Level 1Level 2Level 3Total
Fair Value
Assets:
Cash and cash equivalents$188,495 $— $— $188,495 
Other long-term investments980 — — 980 
Liabilities:
Derivative financial instruments$— $24,244 $— $24,244