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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS (Tables)
6 Months Ended
Mar. 31, 2021
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities Measured at Fair Value
The following table summarizes our assets and liabilities measured at fair value presented in our Unaudited Condensed Consolidated Balance Sheet as of March 31, 2021:
(in thousands)Fair ValueLevel 1Level 2Level 3
Recurring fair value measurements:    
Short-term investments:    
Corporate debt securities129,467 — 129,467 — 
U.S. government and federal agency securities5,024 5,024 — — 
Total short-term investments134,491 5,024 129,467 — 
Cash and cash equivalents427,243 427,243 — — 
Investments14,623 12,711 412 1,500 
Other current assets48,457 48,457 — — 
Other assets2,935 2,935 — — 
Total assets measured at fair value$627,749 $496,370 $129,879 $1,500 
Liabilities:
Contingent earnout liability$8,973 $— $— $8,973 
Schedule of Reconciliation of Changes in the Fair Value of Financial Assets and Liabilities Classified as Level 3
The following table presents a reconciliation of changes in the fair value of our financial liabilities classified as Level 3 fair value measurements in the fair value hierarchy for the indicated periods:
Three Months Ended
March 31,
Six Months Ended
March 31,
(in thousands)2021202020212020
Net liabilities at beginning of period$8,973 $19,873 $9,123 $18,373 
Additions— — — 1,500 
Total gains or losses:
Included in earnings— (3,800)100 (3,800)
Settlements (1)
— (4,250)(250)(4,250)
Net liabilities at end of period$8,973 $11,823 $8,973 $11,823 
(1)Settlements represent earnout payments that have been paid or earned during the period.
Schedule of Quantitative Information about Level 3 Unobservable Inputs
The following table provides quantitative information (in thousands) about our Level 3 unobservable inputs related to our financial liabilities at March 31, 2021:
Fair ValueValuation TechniqueUnobservable InputUnobservable InputRange
Weighted Average (1)
$1,000Monte Carlo simulationDiscount rate1.4 %
Revenue Volatility44.4 %
Risk free rate2.3 %
$7,973Probability analysisDiscount rate0.5 %
Payment amounts
$5,250 - $7,000
$6,400 
Probabilities
40% - 60%
53 %
(1)The weighted average of the payment amounts and the probabilities (Level 3 unobservable inputs), associated with the contingent consideration valued using probability analysis, were weighted by the relative undiscounted fair value of payment amounts and of probability payment amounts, respectively.
Schedule of Supplemental Fair Value Information about Long-Term Fixed-Rate Debt
The following information presents the supplemental fair value information about long-term fixed-rate debt at March 31, 2021 and September 30, 2020:
(in millions)March 31, 2021September 30, 2020
Carrying value of long-term fixed-rate debt$481.6 $480.7 
Fair value of long-term fixed-rate debt535.4 534.5