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Goodwill and other Identifiable Intangible Assets (Tables)
 12 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Amortizable Identifiable Intangible Assets
Amortizable identifiable intangible assets, net as of September 30, 2018 and 2017 were comprised of the following (in thousands):
 
September 30, 2018
 
September 30, 2017
 
Gross
carrying
amount
 
Accum.
amort.
 
Net
 
Gross
carrying
amount
 
Accum.
amort.
 
Net
Purchased and core technology
$
58,102

 
$
(48,693
)
 
$
9,409

 
$
51,292

 
$
(46,304
)
 
$
4,988

License agreements
102

 
(46
)
 
56

 
18

 
(17
)
 
1

Patents and trademarks
15,701

 
(12,242
)
 
3,459

 
12,484

 
(11,280
)
 
1,204

Customer relationships
46,605

 
(21,049
)
 
25,556

 
21,914

 
(16,817
)
 
5,097

Non-compete agreements
600

 
(210
)
 
390

 
600

 
(90
)
 
510

Order backlog
1,800

 
(1,350
)
 
450

 
—

 
—

 
—

Total
$
122,910

 
$
(83,590
)
 
$
39,320

 
$
86,308

 
$
(74,508
)
 
$
11,800
Schedule of Amortization Expense
Amortization expense for fiscal years 2018, 2017 and 2016 was as follows (in thousands):
Fiscal year
Total
2018
$
9,435

2017
$
2,597

2016
$
1,842
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
2019
$
8,888

2020
$
8,118

2021
$
7,422

2022
$
6,554

2023
$
4,362
Schedule of Changes in Carrying Amount of Goodwill
The changes in the carrying amount of goodwill were (in thousands):
 
Fiscal years ended September 30,
 
2018
 
2017
Beginning balance, October 1
$
131,995

 
$
109,448

Acquisitions
23,216

 
21,465

Foreign currency translation adjustment
(676
)
 
1,082

Ending balance, September 30
$
154,535

 
$
131,995