Financial Instruments and Fair Value Measurement (Tables)

9 Months Ended

Jun. 30, 2018

Financial Instruments and Fair Value Measurement

Summary of available-for-sale securities

			Gross		Gross		Estimated
			Unrealized		Unrealized		Fair
	Cost		Gains		Losses		Value
	(in thousands)
Equity Securities:
June 30, 2018	$	38,473	$	39,327	$	—	$	77,800
September 30, 2017	$	38,473	$	31,700	$	—	$	70,173

Summary of assets and liabilities 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		13,794		—		13,794		—
U.S. government and federal agency securities		28,985		28,985		—		—
Total short-term investments		44,279		28,985		15,294		—
Cash and cash equivalents		306,426		306,426		—		—
Investments		77,800		77,800		—		—
Other current assets		34,614		34,614		—		—
Other assets		6,902		6,902		—		—
Total assets measured at fair value	$	470,021	$	454,727	$	15,294	$	—
Liabilities:
Contingent earnout liability	$	9,402	$	—	$	—	$	9,402

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

	Three Months Ended				Nine Months Ended
	June 30,				June 30,
	2018		2017		2018		2017
	(in thousands)
Net liabilities at beginning of period	$	15,702	$	—	$	14,879	$	—
Total gains or losses:
Included in earnings		(175)		14,509		5,148		14,509
Settlements		(6,125)		—		(10,625)		—
Net liabilities at end of period	$	9,402	$	14,509	$	9,402	$	14,509

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

	June 30,		September 30,
	2018		2017
	(in millions)
Carrying value of long-term fixed-rate debt	$	493.7	$	492.9
Fair value of long-term fixed-rate debt	$	516.5	$	529.0