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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS (Tables)
 9 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Summary 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 June 30, 2019:
(in thousands)
Fair Value
 
(Level 1)
 
(Level 2)
 
(Level 3)
Recurring fair value measurements:
 
 
 
 
 
 
 
Short-term investments:
 
 
 
 
 
 
 
Certificates of deposit
$
6,728

 
$
—

 
$
6,728

 
$
—

Corporate and municipal debt securities
12,180

 
—

 
12,180

 
—

U.S. government and federal agency securities
26,840

 
26,840

 
—

 
—

Total short-term investments
45,748

 
26,840

 
18,908

 
—

Cash and cash equivalents
334,775

 
334,775

 
—

 
—

Investments
32,517

 
32,226

 
291

 
—

Other current assets
30,543

 
30,543

 
—

 
—

Other assets
3,788

 
3,788

 
—

 
—

Total assets measured at fair value
$
447,371

 
$
428,172

 
$
19,199

 
$
—

 
 
 
 
 
 
 
 
Liabilities:
 
 
 
 
 
 
 
Contingent earnout liability
$
9,555

 
$
—

 
$
—

 
$
9,555
Schedule of Reconciliation of Changes in the Fair Value of our Financial Assets and Liabilities Classified as Level 3
The following table presents a reconciliation of changes in the fair value of our financial assets and liabilities classified as Level 3 fair value measurements in the fair value hierarchy for the indicated periods:
 
Three Months Ended
June 30,
 
Nine Months Ended
June 30,
(in thousands)
2019
 
2018
 
2019
 
2018
Net liabilities at beginning of period
$
9,015

 
$
15,702

 
$
11,160

 
$
14,879

Additions
—

 
—

 
673

 
—

Total gains or losses:
 
 
 
 
 
 
 
Included in earnings
540

 
(175
)
 
(2,278
)
 
5,148

Settlements (1)
—

 
(6,125
)
 
—

 
(10,625
)
Net liabilities at end of period
$
9,555

 
$
9,402

 
$
9,555

 
$
9,402


(1)
Settlements represent earnout payments that have been paid or earned during the period. 
Schedule of Quantitative Information on Level 3 Unobservable Inputs
The following table provides quantitative information about our Level 3 unobservable inputs at June 30, 2019:
 
(in thousands)
Fair Value
 
Valuation Technique
 
Unobservable Input
 
Percentage
Contingent Consideration
$
9,555

 
Monte Carlo simulation
 
Discount rate
 
11.0
%
 
 
 
 
 
Revenue volatility
 
13.0
%
 
 
 
 
 
Risk free rate
 
2.0
%
Summary 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 June 30, 2019 and September 30, 2018:
(in millions)
June 30, 2019
 
September 30, 2018
Carrying value of long-term fixed-rate debt
$
491.7

 
$
494.0

Fair value of long-term fixed-rate debt
$
530.0

 
$
509.3
Summary of Equity Securities
The following is a summary of our securities, which excludes assets held in a Non-Qualified Supplemental Savings Plan:
(in thousands)
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Estimated
Fair
Value
Equity Securities:
 
 
 
 
 
 
 
June 30, 2019
$
38,473

 
$
14,865

 
$
(21,112
)
 
$
32,226

September 30, 2018
$
38,473

 
$
44,023

 
$
—

 
$
82,496