Fair Value Measures (Tables)

3 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

Assets and liabilities measured at fair value on a recurring basis at December 31, 2018 and September 30, 2018 consisted of the following (dollars in thousands):

	December 31, 2018
	Level 1		Level 2			Level 3			Total
Assets:
Money market funds(a)	$	185,713	$	—		$	—		$	185,713
Time deposits(b)	—		97,743			—			97,743
Commercial paper, $20,176 at cost(b)	—		20,287			—			20,287
Corporate notes and bonds, $58,308 at cost(b)	—		58,153			—			58,153
Foreign currency exchange contracts(b)	—		463			—			463
Total assets at fair value	$	185,713	$	176,646		$	—		$	362,359
Liabilities:
Foreign currency exchange contracts(b)	$	—	$	(130	)	$	—		$	(130	)
Contingent acquisition payments(c)	—		—			(3,979		)	(3,979		)
Total liabilities at fair value	$	—	$	(130	)	$	(3,979	)	$	(4,109	)

	September 30, 2018
	Level 1		Level 2			Level 3			Total
Assets:
Money market funds(a)	$	200,004	$	—		$	—		$	200,004
Time deposits(b)	—		88,158			—			88,158
Commercial paper, $27,194 at cost(b)	—		27,363			—			27,363
Corporate notes and bonds, $57,563 at cost(b)	—		57,417			—			57,417
Foreign currency exchange contracts(b)	—		143			—			143
Total assets at fair value	$	200,004	$	173,081		$	—		$	373,085
Liabilities:
Foreign currency exchange contracts(b)	$	—	$	(1,192	)	$	—		$	(1,192	)
Contingent acquisition payments(c)	—		—			(4,000		)	(4,000		)
Total liabilities at fair value	$	—	$	(1,192	)	$	(4,000	)	$	(5,192	)

Changes in Fair Value of Contingent Earn-Out Liabilities

The following table provides a summary of changes in the aggregate fair value of the contingent acquisition payments for all periods presented (dollars in thousands):

	Three Months Ended December 31,
	2018			2017
Balance at beginning of period	$	4,000		$	8,648
Earn-out liabilities established at time of acquisition	—			500
Payments and foreign currency translation	(21		)	(17		)
Adjustments to fair value included in acquisition-related costs, net	—			1,300
Balance at end of period	$	3,979		$	10,431