Goodwill and Other Identifiable Intangible Assets, Net (Tables)

6 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Amortizable Identifiable Intangible Assets

Amortizable identifiable intangible assets were (in thousands):

	March 31, 2017							September 30, 2016
	Gross carrying amount		Accum. amort.			Net		Gross carrying amount		Accum. amort.			Net
Purchased and core technology	$	50,720	$	(45,079	)	$	5,641	$	46,594	$	(44,999	)	$	1,595
License agreements	18		(12		)	6		18		(10		)	8
Patents and trademarks	12,334		(10,974		)	1,360		11,619		(10,871		)	748
Customer relationships	21,517		(15,930		)	5,587		17,463		(15,773		)	1,690
Non-compete agreements	600		(30		)	570		—		—			—
Total	$	85,189	$	(72,025	)	$	13,164	$	75,694	$	(71,653	)	$	4,041

Schedule of Estimated Future Amortization Expense Related to Identifiable Intangible Assets

Estimated amortization expense related to identifiable intangible assets for the remainder of fiscal 2017 and the five succeeding fiscal years is (in thousands):

2017 (six months)	$	1,255
2018	2,475
2019	1,989
2020	1,476
2021	1,268
2022	1,097

Schedule of Changes in Carrying Amount of Goodwill

The changes in the carrying amount of goodwill are (in thousands):

	Six months ended March 31,
	2017			2016
Beginning balance, October 1	$	109,448		$	100,183
Acquisitions	21,206			11,020
Foreign currency translation adjustment	(733		)	(496		)
Ending balance, March 31	$	129,921		$	110,707