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Goodwill and other Identifiable Intangible Assets (Tables)
 12 Months Ended
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Amortizable Identifiable Intangible Assets
Amortizable identifiable intangible assets, net as of September 30, 2017 and 2016 were comprised of the following (in thousands):
 
September 30, 2017
 
September 30, 2016
 
Gross
carrying
amount
 
Accum.
amort.
 
Net
 
Gross
carrying
amount
 
Accum.
amort.
 
Net
Purchased and core technology
$
51,292

 
$
(46,304
)
 
$
4,988

 
$
46,594

 
$
(44,999
)
 
$
1,595

License agreements
18

 
(17
)
 
1

 
18

 
(10
)
 
8

Patents and trademarks
12,484

 
(11,280
)
 
1,204

 
11,619

 
(10,871
)
 
748

Customer relationships
21,914

 
(16,817
)
 
5,097

 
17,463

 
(15,773
)
 
1,690

Non-compete agreements
600

 
(90
)
 
510

 
—

 
—

 
—

Total
$
86,308

 
$
(74,508
)
 
$
11,800

 
$
75,694

 
$
(71,653
)
 
$
4,041
Schedule of Amortization Expense
Amortization expense for fiscal years 2017, 2016 and 2015 was as follows (in thousands):
Fiscal year
Total
2017
$
2,597

2016
$
1,842

2015
$
2,427
Schedule of Estimated Future Amortization Expense Related to Identifiable Intangible Assets
Estimated amortization expense for the next five years is as follows (in thousands):
Fiscal year
Total
2018
$
2,708

2019
$
2,341

2020
$
1,841

2021
$
1,484

2022
$
1,215
Schedule of Changes in Carrying Amount of Goodwill
The changes in the carrying amount of goodwill were (in thousands):
 
Fiscal years ended September 30,
 
2017
 
2016
Beginning balance, October 1
$
109,448

 
$
100,183

Acquisitions
21,465

 
10,985

Foreign currency translation adjustment
1,082

 
(1,720
)
Ending balance, September 30
$
131,995

 
$
109,448