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Goodwill and Other Intangible Assets | 12 Months Ended
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Sep. 30, 2024
Goodwill and Other Intangible Assets |
Goodwill and Other Intangible Assets | 3. Goodwill and Other Intangible Assets Included on the Consolidated Balance Sheets at September 30, 2024 and 2023 are the following intangible assets gross carrying amounts and accumulated amortization: ​
​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2024 |  | 2023
Goodwill | ​ | $ | 539,899 | ​ | 503,177
​ | ​ |  | ​ | ​ | ​
Intangible assets with determinable lives: | ​ |  | ​ | ​ | ​
Patents | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 2,638 | ​ | 2,516
Less: accumulated amortization | ​ |  | 1,415 | ​ | 1,218
Net | ​ | $ | 1,223 | ​ | 1,298
​ | ​ |  | ​ | ​ | ​
Capitalized software | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 134,119 | ​ | 121,883
Less: accumulated amortization | ​ |  | 92,878 | ​ | 80,774
Net | ​ | $ | 41,241 | ​ | 41,109
​ | ​ |  | ​ | ​ | ​
Customer Relationships | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 330,328 | ​ | 296,927
Less: accumulated amortization | ​ |  | 132,135 | ​ | 113,311
Net | ​ | $ | 198,193 | ​ | 183,616
​ | ​ |  | ​ | ​ | ​
Other | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 15,182 | ​ | 14,232
Less: accumulated amortization | ​ |  | 11,173 | ​ | 9,578
Net | ​ | $ | 4,009 | ​ | 4,654
Intangible assets with indefinite lives: | ​ |  | ​ | ​ | ​
Trade names | ​ | $ | 162,936 | ​ | 161,447
​ We performed our annual evaluation of goodwill and intangible assets for impairment during the fourth quarter of 2024 and concluded that no impairment existed at September 30, 2024. There were no accumulated impairment losses as of September 30, 2024. The changes in the carrying amount of goodwill attributable to each business segment for 2024 and 2023 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in millions) |  | A&D |  | Test |  | USG |  | Total
Balance as of September 30, 2022 | ​ | $ | 110.0 | ​ | ​ | 34.0 | ​ | 348.7 | ​ | 492.7
Acquisition activity | ​ | ​ | 5.6 | ​ | ​ | — | ​ | — | ​ | 5.6
Foreign currency translation and other | ​ | ​ | — | ​ | ​ | — | ​ | 4.9 | ​ | 4.9
Balance as of September 30, 2023 | ​ | $ | 115.6 | ​ | ​ | 34.0 | ​ | 353.6 | ​ | 503.2
Acquisition activity | ​ | ​ | — | ​ | ​ | 30.9 | ​ | — | ​ | 30.9
Foreign currency translation and other | ​ | ​ | — | ​ | ​ | 2.5 | ​ | 3.3 | ​ | 5.8
Balance as of September 30, 2024 | ​ | $ | 115.6 | ​ | ​ | 67.4 | ​ | 356.9 | ​ | 539.9
​ Amortization expense related to intangible assets with determinable lives was $32.8 million, $29.0 million and $25.9 million in 2024, 2023 and 2022, 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 2025 through 2029 is estimated at approximately $31 million to $33 million per year.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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