FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS (Tables)

12 Months Ended

Sep. 30, 2018

FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS

Summary of assets measured at fair value

	Fair Value		(Level 1)		(Level 2)		(Level 3)
	(in thousands)
Recurring fair value measurements:
Short-term investments:
Certificates of deposit	$	1,500	$	—	$	1,500	$	—
Corporate and municipal debt securities		17,518		—		17,518		—
U.S. government and federal agency securities		22,443		22,443		—		—
Total short-term investments		41,461		22,443		19,018		—
Cash and cash equivalents		284,355		284,355		—		—
Investments		82,496		82,496		—		—
Other current assets		39,830		39,830		—		—
Other assets		2,000		2,000		—		—
Total assets measured at fair value	$	450,142	$	431,124	$	19,018	$	—
Liabilities:
Contingent earnout liability	$	11,160	$	—	$	—	$	11,160

Schedule of reconciliation of changes in the fair value of our financial assets and liabilities classified as Level 3

	2018		2017
	(in thousands)
Net liabilities at beginning of period	$	14,879	$	—
Total gains or losses:
Included in earnings		6,906		14,879
Settlements (1)		(10,625)		—
Net liabilities at end of period	$	11,160	$	14,879

(1) Settlements represent earnout payments that have been earned or paid during the period.

Summary of supplemental fair value information about long-term fixed-rate debt

	September 30,
	2018		2017
	(in millions)
Carrying value of long-term fixed-rate debt	$	494.0	$	492.9
Fair value of long-term fixed-rate debt	$	509.3	$	529.0

Summary of available-for-sale securities

			Gross		Gross		Estimated
			Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
	(in thousands)
Equity Securities:
September 30, 2018	$	38,473	$	44,023	$	—	$	82,496
September 30, 2017	$	38,473	$	31,700	$	—	$	70,173