Fair Value Measurements (Tables)

6 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value, by Balance Sheet Grouping

Our significant financial assets and liabilities measured at fair value on a recurring basis as of March 31, 2018 and September 30, 2017 were as follows:

	March 31, 2018
	Level 1		Level 2		Level 3		Total
	(in thousands)
Financial assets:
Cash equivalents	$	82,291	$	—	$	—	$	82,291
Marketable securities
Certificates of deposit	—		219		—		219
Corporate notes/bonds	52,650		—		—		52,650
U.S. government agency securities	—		2,395		—		2,395
Forward contracts	—		827		—		827
	$	134,941	$	3,441	$	—	$	138,382
Financial liabilities:
Contingent consideration related to acquisitions	$	—	$	—	$	6,743	$	6,743
Forward contracts	—		4,837		—		4,837
	$	—	$	4,837	$	6,743	$	11,580

	September 30, 2017
	Level 1		Level 2		Level 3		Total
	(in thousands)
Financial assets:
Cash equivalents	$	49,845	$	—	$	—	$	49,845
Marketable securities
Certificates of deposit	—		240		—		240
Corporate notes/bonds	47,673		—		—		47,673
U.S. government agency securities	—		2,402		—		2,402
Forward contracts	—		1,163		—		1,163
	$	97,518	$	3,805	$	—	$	101,323
Financial liabilities:
Contingent consideration related to acquisitions	$	—	$	—	$	8,400	$	8,400
Forward contracts	—		4,347		—		4,347
	$	—	$	4,347	$	8,400	$	12,747

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

Changes in the fair value of Level 3 contingent consideration liability associated with our acquisitions were as follows:

	Contingent Consideration
	(in thousands)
	Kepware			Other		Total
Balance, October 1, 2017	$	8,400		$	—	$	8,400
Addition to contingent consideration	—			2,100		2,100
Payment of contingent consideration	(3,757		)	—		(3,757		)
Balance, March 31, 2018	$	4,643		$	2,100	$	6,743

	Contingent Consideration
	(in thousands)
	ColdLight			Kepware			Total
Balance, October 1, 2016	$	2,500		$	17,070		$	19,570
Change in present value of contingent consideration	—			148			148
Payment of contingent consideration	(1,250		)	(1,800		)	(3,050		)
Balance, April 1, 2017	$	1,250		$	15,418		$	16,668