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Goodwill And Intangible Assets
 12 Months Ended
Oct. 03, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill And Intangible Assets Goodwill and Intangible Assets
The changes in the carrying amount of goodwill are as follows:
 
Aircraft
Controls
Space and
Defense
Controls
Industrial
Systems
Total
Balance at September 30, 2017
$
181,375

$
259,951

$
332,942

$
774,268

Acquisitions
—

3,769

27,329

31,098

Divestiture
—

(1,836
)
—

(1,836
)
Foreign currency translation
(1,468
)
(152
)
(4,693
)
(6,313
)
Balance at September 29, 2018
179,907

261,732

355,578

797,217

Divestiture
—

—

(1,237
)
(1,237
)
Foreign currency translation
(2,968
)
(48
)
(8,724
)
(11,740
)
Balance at September 28, 2019
176,939

261,684

345,617

784,240

Acquisition
—

—

25,237

25,237

Divestiture
—

—

(635
)
(635
)
Foreign currency translation
2,582

42

10,390

13,014

Balance at October 3, 2020
$
179,521

$
261,726

$
380,609

$
821,856


Goodwill in our Space and Defense Controls segment is net of a $4,800 accumulated impairment loss at October 3, 2020. Goodwill in our Medical Devices reporting unit, included in our Industrial Systems segment, is net of a $38,200 accumulated impairment loss at October 3, 2020.
The components of intangible assets are as follows:

 
October 3, 2020
September 28, 2019
  
Weighted-
Average
Life (years)
Gross Carrying
Amount
Accumulated
Amortization
Gross Carrying
Amount
Accumulated
Amortization
Customer-related
11
$
140,048

$
(103,733
)
$
132,697

$
(100,091
)
Technology-related
9
77,060

(54,833
)
69,220

(52,192
)
Program-related
23
38,963

(17,340
)
62,015

(35,680
)
Marketing-related
8
25,581

(20,981
)
23,139

(19,899
)
Other
10
4,134

(3,853
)
4,061

(3,624
)
Intangible assets
12
$
285,786

$
(200,740
)
$
291,132

$
(211,486
)

Substantially all acquired intangible assets other than goodwill are being amortized. Customer-related intangible assets primarily consist of customer relationships. Technology-related intangible assets primarily consist of technology, patents, intellectual property and software. Program-related intangible assets consist of long-term programs represented by current contracts and probable follow on work. Marketing-related intangible assets primarily consist of trademarks, trade names and non-compete agreements.
In 2020, we recorded a $8,723 write down of intangible assets based on expected cash flows over the remaining life of the assets in relation to the impairment charges associated with the COVID-19 pandemic. In 2018, we recorded a $12,316 write down of intangible assets related to impairment charges taken on the wind pitch control business we exited.
Amortization of acquired intangible assets is as follows:
 
2020
2019
2018
Acquired intangible asset amortization
$
12,524

$
13,079

$
17,037


Based on acquired intangible assets recorded at October 3, 2020, amortization is estimated to be approximately:
 
2021
2022
2023
2024
2025
Estimated future amortization of acquired intangible assets
$
10,800

$
10,600

$
9,700

$
9,300

$
8,200