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Goodwill and Other Identifiable Intangible Assets, Net (Tables)
 3 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Amortizable Intangible Assets
Amortizable intangible assets were (in thousands):
 
December 31, 2019
 
September 30, 2019
 
Gross
carrying
amount
 
Accum.
amort.
 
Net
 
Gross
carrying
amount
 
Accum.
amort.
 
Net
Purchased and core technology
$
71,772

 
$
(52,097
)
 
$
19,675

 
$
57,699

 
$
(50,986
)
 
$
6,713

License agreements
102

 
(81
)
 
21

 
102

 
(74
)
 
28

Patents and trademarks
22,636

 
(12,263
)
 
10,373

 
14,577

 
(11,970
)
 
2,607

Customer relationships
127,557

 
(26,893
)
 
100,664

 
46,315

 
(25,266
)
 
21,049

Non-compete agreements
600

 
(360
)
 
240

 
600

 
(330
)
 
270

Order backlog
1,800

 
(1,800
)
 
—

 
1,800

 
(1,800
)
 
—

Total
$
224,467

 
$
(93,494
)
 
$
130,973

 
$
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 (nine months)
$
12,029

2021
$
15,210

2022
$
14,366

2023
$
12,167

2024
$
11,464

2025
$
8,007
Schedule of Changes in Carrying Amount of Goodwill
The changes in the carrying amount of goodwill by reportable segments are (in thousands):
 
Three months ended December 31,
 
IoT
Products and Services
 
IoT
Solutions
 
Total
Balance on September 30, 2019
$
103,519

 
$
49,903

 
$
153,422

Acquisitions
60,479

 
—

 
60,479

Foreign currency translation adjustment
730

 
173

 
903

Balance at December 31, 2019
$
164,728

 
$
50,076

 
$
214,804