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Fair Value of Financial Instruments
6 Months Ended
Mar. 31, 2022
Fair Value Disclosures [Abstract]  
Fair Value of Financial Instruments
5. FAIR VALUE OF FINANCIAL INSTRUMENTS
The Company is required to record certain assets and liabilities at fair value. The valuation methods used for determining the fair value of these financial instruments by hierarchy are as follows:
Level 1
Cash and cash equivalents consist of various bank accounts used to support our operations and investments in institutional money-market funds that are traded in active markets.
Other long-term investments represent the fair value of investments under our supplemental employee retirement plan (“SERP”). The fair value of the investments is determined through quoted market prices within actively traded markets.
Level 2
Derivative financial instruments include foreign exchange contracts and an interest rate swap contract. The fair value of our derivative instruments is estimated using standard valuation models and market-based observable inputs over the contractual term, including one-month London Inter-bank Offered Rate (“LIBOR”) based yield curves for the interest rate swap, and forward rates and/or the Overnight Index Swap curve for forward foreign exchange contracts, among others.
Level 3No Level 3 financial instruments
The following table presents financial instruments, other than debt, that we measure at fair value on a recurring basis. See Note 11 of this Report on Form 10-Q 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 it based on the lowest level input that is significant to the determination of the fair value. 
Level 1Level 2Level 3Total Fair Value
March 31, 2022September 30, 2021March 31, 2022September 30, 2021March 31, 2022September 30, 2021March 31, 2022September 30, 2021
Assets:
Cash and cash equivalents$237,685 $185,979 $— $— $— $— $237,685 $185,979 
Other long-term investments1,541 1,439 — — — — 1,541 1,439 
Derivative financial instruments— — 43,027 12,335 — — 43,027 12,335 
Total assets$239,226 $187,418 $43,027 $12,335 $— $— $282,253 $199,753 
Liabilities:
Derivative financial instruments— — 489 3,383 — — 489 3,383 
Total liabilities$— $— $489 $3,383 $— $— $489 $3,383