Goodwill and Other Identifiable Intangible Assets, Net (Tables)

6 Months Ended

Mar. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Amortizable Identifiable Intangible Assets

Amortizable identifiable intangible assets were (in thousands):

	March 31, 2018							September 30, 2017
	Gross carrying amount		Accum. amort.			Net		Gross carrying amount		Accum. amort.			Net
Purchased and core technology	$	58,541	$	(47,787	)	$	10,754	$	51,292	$	(46,304	)	$	4,988
License agreements	102		(32		)	70		18		(17		)	1
Patents and trademarks	15,542		(11,701		)	3,841		12,484		(11,280		)	1,204
Customer relationships	46,918		(19,082		)	27,836		21,914		(16,817		)	5,097
Non-compete agreements	600		(150		)	450		600		(90		)	510
Order backlog	1,800		(450		)	1,350		—		—			—
Total	$	123,503	$	(79,202	)	$	44,301	$	86,308	$	(74,508	)	$	11,800

Schedule of Estimated Future Amortization Expense Related to Identifiable Intangible Assets

Estimated amortization expense related to identifiable intangible assets for the remainder of fiscal 2018 and the five succeeding fiscal years is (in thousands):

2018 (six months)	$	4,945
2019	8,360
2020	7,595
2021	7,130
2022	6,758
2023	4,751

Schedule of Changes in Carrying Amount of Goodwill

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

	Six months ended March 31,
	2018		2017
Beginning balance, October 1	$	131,995	$	109,448
Acquisitions	23,614		21,206
Foreign currency translation adjustment	373		(733		)
Ending balance, March 31	$	155,982	$	129,921