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Goodwill And Intangible Assets | 12 Months Ended
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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 |

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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