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Goodwill and Other Identifiable Intangible Assets, Net (Tables)
 6 Months Ended
Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Amortizable Intangible Assets
Amortizable intangible assets were (in thousands):
 
March 31, 2020
 
September 30, 2019
 
Gross
carrying
amount
 
Accum.
amort.
 
Net
 
Gross
carrying
amount
 
Accum.
amort.
 
Net
Purchased and core technology
$
75,662

 
$
(52,802
)
 
$
22,860

 
$
57,699

 
$
(50,986
)
 
$
6,713

License agreements
102

 
(88
)
 
14

 
102

 
(74
)
 
28

Patents and trademarks
22,662

 
(12,667
)
 
9,995

 
14,577

 
(11,970
)
 
2,607

Customer relationships
125,255

 
(29,084
)
 
96,171

 
46,315

 
(25,266
)
 
21,049

Non-compete agreements
600

 
(390
)
 
210

 
600

 
(330
)
 
270

Order backlog
1,800

 
(1,800
)
 
—

 
1,800

 
(1,800
)
 
—

Total
$
226,081

 
$
(96,831
)
 
$
129,250

 
$
121,093

 
$
(90,426
)
 
$
30,667
Schedule of Estimated Future Amortization Expense Related to Intangible Assets
Estimated amortization expense related to intangible assets for the remainder of fiscal 2020 and the five succeeding fiscal years is (in thousands):
2020 (six months)
$
8,145

2021
$
15,520

2022
$
14,676

2023
$
12,488

2024
$
11,785

2025
$
8,328
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,
 
IoT
Products and Services
 
IoT
Solutions
 
Total
Balance on September 30, 2019
$
103,519

 
$
49,903

 
$
153,422

Acquisitions
54,686

 
—

 
54,686

Foreign currency translation adjustment
(27
)
 
(731
)
 
(758
)
Balance at March 31, 2020
$
158,178

 
$
49,172

 
$
207,350