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FAIR VALUE OF FINANCIAL INSTRUMENTS
9 Months Ended
Jun. 30, 2020
Fair Value Disclosures [Abstract]  
FAIR VALUE OF FINANCIAL INSTRUMENTS FAIR VALUE OF FINANCIAL INSTRUMENTS
Fair value is defined as the price that would be received from the sale of an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date.  The FASB established a three-level hierarchy for disclosure based on the extent and level of judgment used to estimate fair value.  Level 1 inputs consist of valuations based on quoted market prices in active markets for identical assets or liabilities.  Level 2 inputs consist of valuations based on quoted prices for similar assets or liabilities, quoted prices for identical assets or liabilities in an inactive market, or other observable inputs.  Level 3 inputs consist of valuations based on unobservable inputs that are supported by little or no market activity.
The following table presents financial instruments, other than debt, that we measured at fair value on a recurring basis at June 30, 2020 and September 30, 2019.  See Note 10 of this Report on Form 10-Q for a discussion of our debt. We have classified the following assets and liabilities in accordance with the fair value hierarchy set forth in the applicable standards.  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. 
June 30, 2020Level 1Level 2Level 3Total Fair Value
Assets:
Cash and cash equivalents$354,708  $—  $—  $354,708  
Other long-term investments1,147  —  —  1,147  
Total assets$355,855  $—  $—  $355,855  
Liabilities:
Derivative financial instruments—  41,692  —  41,692  
Total liabilities$—  $41,692  $—  $41,692  

September 30, 2019Level 1Level 2Level 3Total Fair Value
Assets:
Cash and cash equivalents$188,495  $—  $—  $188,495  
Other long-term investments980  —  —  980  
Total assets$189,475  $—  $—  $189,475  
Liabilities:
Derivative financial instruments—  24,244  —  24,244  
Total liabilities$—  $24,244  $—  $24,244  
Our 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. We invest only in AAA-rated, prime institutional money market funds, comprised of high quality, short-term fixed income securities. Our other long-term investments represent the fair value of investments under the Cabot Microelectronics Supplemental Employee Retirement Plan ("SERP"), which is a non-qualified supplemental savings plan. The fair value of the investments is determined through quoted market prices within actively traded markets. Although the investments are allocated to individual participants and investment decisions are made solely by those participants, the SERP is a non-qualified plan. Consequently, the Company owns the assets and the related offsetting liability for disbursement until such time as a participant makes a qualifying withdrawal. 
Our 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. We consider the risk of nonperformance, including counterparty credit risk, in the calculation of the fair value of derivative financial instruments.  See Note 12 of this Report on Form 10-Q for more information on our use of derivative financial instruments.