FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

9 Months Ended

Jun. 30, 2018

FAIR VALUE OF FINANCIAL INSTRUMENTS [Abstract]

Fair Value of Financial Instruments

The following table presents financial instruments, other than long-term debt, that we measured at fair value on a recurring basis at June 30, 2018 and September 30, 2017.  See Note 8 for a detailed discussion of our long-term 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, 2018	Level 1		Level 2		Level 3		Total Fair Value
Assets:
Cash and cash equivalents	$	174,089	$	12,035	$	-	$	186,124
Other long-term investments		1,089		-		-		1,089
Available-for-sale securities:
Asset Backed Securities				13,901				13,901
Certificates of Deposit				2,442				2,442
Commercial Paper				7,754				7,754
Corporate debt securities				75,260				75,260
U.S. Treasuries				25,098				25,098
Derivative financial instruments		-		8		-		8
Total assets	$	175,178	$	136,498	$	-	$	311,676
Liabilities:
Derivative financial instruments		-		44		-		44
Total liabilities	$	-	$	44	$	-	$	44

September 30, 2017	Level 1		Level 2		Level 3		Total Fair Value
Assets:
Cash and cash equivalents	$	397,890	$	-	$	-	$	397,890
Other long-term investments		929		-		-		929
Derivative financial instruments		-		263		-		263
Total assets	$	398,819	$	263	$	-	$	399,082
Liabilities:
Derivative financial instruments		-		1,881		-		1,881
Total liabilities	$	-	$	1,881	$	-	$	1,881