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Goodwill and other Identifiable Intangible Assets (Tables)
 12 Months Ended
Sep. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Amortizable Identifiable Intangible Assets
Amortizable identifiable intangible assets, net as of September 30, 2016 and 2015 were comprised of the following (in thousands):
 
September 30, 2016
 
September 30, 2015
 
Gross
carrying
amount
 
Accum.
amort.
 
Net
 
Gross
carrying
amount
 
Accum.
amort.
 
Net
Purchased and core technology
$
46,594

 
$
(44,999
)
 
$
1,595

 
$
45,449

 
$
(45,424
)
 
$
25

License agreements
18

 
(10
)
 
8

 
18

 
(4
)
 
14

Patents and trademarks
11,619

 
(10,871
)
 
748

 
11,377

 
(10,385
)
 
992

Customer relationships
17,463

 
(15,773
)
 
1,690

 
17,090

 
(15,473
)
 
1,617

Total
$
75,694

 
$
(71,653
)
 
$
4,041

 
$
73,934

 
$
(71,286
)
 
$
2,648
Schedule of Amortization Expense
Amortization expense for fiscal years 2016, 2015 and 2014 was as follows (in thousands):
Fiscal year
Total
2016
$
1,842

2015
$
2,427

2014
$
3,076
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
2017
$
1,350

2018
$
950

2019
$
723

2020
$
665

2021
$
129
Schedule of Changes in Carrying Amount of Goodwill
The changes in the carrying amount of goodwill were (in thousands):
 
Fiscal years ended September 30,
 
2016
 
2015
Beginning balance, October 1
$
100,183

 
$
101,484

Acquisition of Bluenica Corporation
10,985

 
—

Foreign currency translation adjustment
(1,720
)
 
(1,301
)
Ending balance, September 30
$
109,448

 
$
100,183