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Goodwill and Other Intangible Assets | 12 Months Ended
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Sep. 30, 2022
Goodwill and Other Intangible Assets |
Goodwill and Other Intangible Assets | 4. Goodwill and Other Intangible Assets Included on the Consolidated Balance Sheets at September 30, 2022 and 2021 are the following intangible assets gross carrying amounts and accumulated amortization: ​
​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2022 |  | 2021
Goodwill | ​ | $ | 492,709 | ​ | 504,853
​ | ​ |  | ​ | ​ | ​
Intangible assets with determinable lives: | ​ |  | ​ | ​ | ​
Patents | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 2,353 | ​ | 2,131
Less: accumulated amortization | ​ |  | 1,091 | ​ | 972
Net | ​ | $ | 1,262 | ​ | 1,159
​ | ​ |  | ​ | ​ | ​
Capitalized software | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 106,583 | ​ | 93,671
Less: accumulated amortization | ​ |  | 70,476 | ​ | 63,740
Net | ​ | $ | 36,107 | ​ | 29,931
​ | ​ |  | ​ | ​ | ​
Customer Relationships | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 287,447 | ​ | 288,530
Less: accumulated amortization | ​ |  | 96,921 | ​ | 80,882
Net | ​ | $ | 190,526 | ​ | 207,648
​ | ​ |  | ​ | ​ | ​
Other | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 13,985 | ​ | 13,177
Less: accumulated amortization | ​ |  | 7,440 | ​ | 4,398
Net | ​ | $ | 6,545 | ​ | 8,779
Intangible assets with indefinite lives: | ​ |  | ​ | ​ | ​
Trade names | ​ | $ | 160,024 | ​ | 161,733
​ We performed our annual evaluation of goodwill and intangible assets for impairment during the fourth quarter of 2022 and concluded that no impairment existed at September 30, 2022. There were no accumulated impairment losses as of September 30, 2022. The changes in the carrying amount of goodwill attributable to each business segment for 2022 and 2021 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in millions) |  | A&D |  | Test |  | USG |  | Total
Balance as of September 30, 2020 | ​ | $ | 102.1 |  | ​ | 34.1 |  | 271.9 |  | 408.1
Acquisition activity | ​ | ​ | 2.2 | ​ | ​ | — | ​ | 95.2 | ​ | 97.4
Foreign currency translation and other | ​ | ​ | — | ​ | ​ | — | ​ | (0.6) | ​ | (0.6)
Balance as of September 30, 2021 | ​ | $ | 104.3 | ​ | ​ | 34.1 | ​ | 366.5 | ​ | 504.9
Acquisition activity | ​ | ​ | 5.7 | ​ | ​ | — | ​ | (4.7) | ​ | 1.0
Foreign currency translation and other | ​ | ​ | — | ​ | ​ | (0.1) | ​ | (13.1) | ​ | (13.2)
Balance as of September 30, 2022 | ​ | $ | 110.0 | ​ | ​ | 34.0 | ​ | 348.7 | ​ | 492.7
​ Amortization expense related to intangible assets with determinable lives was $25.9 million, $20.8 million and $21.8 million in 2022, 2021 and 2020, respectively. Patents are amortized over the life of the patents, generally ten to twenty years. Capitalized software is amortized over the estimated useful life of the software, generally three to seven years. Customer relationships are generally amortized over thirteen to twenty years. Intangible asset amortization for fiscal years 2023 through 2027 is estimated at $18.5 million in 2023, and approximately $17 million in years 2024 through 2027.

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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 https://asc.fasb.org/topic&trid=2144416 + Details
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