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Goodwill and Other Identifiable Intangible Assets, Net (Tables)
 6 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Amortizable Intangible Assets
Amortizable intangible assets were (in thousands):
 
March 31, 2019
 
September 30, 2018
 
Gross
carrying
amount
 
Accum.
amort.
 
Net
 
Gross
carrying
amount
 
Accum.
amort.
 
Net
Purchased and core technology
$
58,011

 
$
(49,938
)
 
$
8,073

 
$
58,102

 
$
(48,693
)
 
$
9,409

License agreements
102

 
(60
)
 
42

 
102

 
(46
)
 
56

Patents and trademarks
15,835

 
(12,777
)
 
3,058

 
15,701

 
(12,242
)
 
3,459

Customer relationships
46,530

 
(23,226
)
 
23,304

 
46,605

 
(21,049
)
 
25,556

Non-compete agreements
600

 
(270
)
 
330

 
600

 
(210
)
 
390

Order backlog
1,800

 
(1,800
)
 
—

 
1,800

 
(1,350
)
 
450

Total
$
122,878

 
$
(88,071
)
 
$
34,807

 
$
122,910

 
$
(83,590
)
 
$
39,320
Schedule of Estimated Future Amortization Expense Related to Intangible Assets
Estimated amortization expense related to intangible assets for the remainder of fiscal 2019 and the five succeeding fiscal years is (in thousands):
2019 (six months)
$
4,193

2020
8,237

2021
7,430

2022
6,568

2023
4,392

2024
3,701
Schedule of Changes in Carrying Amount of Goodwill
The changes in the carrying amount of goodwill by reportable segments are (in thousands):
 
Six Months Ended March 31, 2019
 
IoT
Products and Services
 
IoT
Solutions
 
Total
Beginning balance, October 1
$
104,358

 
$
50,177

 
$
154,535

Acquisitions
—

 
—

 
—

Foreign currency translation adjustment
(122
)
 
(364
)
 
(486
)
Ending balance, March 31
$
104,236

 
$
49,813

 
$
154,049