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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Sep. 30, 2024
Goodwill and Other Intangible Assets |
Schedule of 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
Schedule of carrying amount of goodwill attributable to each business segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(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

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