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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 6 Months Ended
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Mar. 31, 2024
GOODWILL AND OTHER INTANGIBLE ASSETS |
Schedule of intangible assets gross carrying amounts and accumulated amortization | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, |  | September 30,
(Dollars in thousands) |  | 2024 |  | 2023
Goodwill | ​ | $ | 535,661 | ​ | 503,177
​ | ​ |  | ​ | ​ | ​
Intangible assets with determinable lives: | ​ |  | ​ | ​ | ​
Patents | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 2,516 | ​ | 2,516
Less: accumulated amortization | ​ |  | 1,287 | ​ | 1,218
Net | ​ | $ | 1,229 | ​ | 1,298
​ | ​ |  | ​ | ​ | ​
Capitalized software | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 128,042 | ​ | 121,883
Less: accumulated amortization | ​ |  | 86,622 | ​ | 80,774
Net | ​ | $ | 41,420 | ​ | 41,109
​ | ​ |  | ​ | ​ | ​
Customer relationships | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 327,695 | ​ | 296,927
Less: accumulated amortization | ​ |  | 122,542 | ​ | 113,311
Net | ​ | $ | 205,153 | ​ | 183,616
​ | ​ |  | ​ | ​ | ​
Other | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 15,144 | ​ | 14,232
Less: accumulated amortization | ​ |  | 10,870 | ​ | 9,578
Net | ​ | $ | 4,274 | ​ | 4,654
Intangible assets with indefinite lives: | ​ |  | ​ | ​ | ​
Trade names | ​ | $ | 162,796 | ​ | 161,447
Schedule of carrying amount of goodwill attributable to each business segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Aerospace | ​ | ​
(Dollars in millions) |  | USG |  | Test |  | & Defense |  | Total
Balance as of September 30, 2023 | ​ | $ | 353.6 |  | ​ | 34.0 |  | 115.6 |  | 503.2
Acquisition activity | ​ | ​ | — | ​ | ​ | 30.3 | ​ | — | ​ | 30.3
Foreign currency translation | ​ | ​ | 1.4 | ​ | ​ | 0.8 | ​ | — | ​ | 2.2
Balance as of March 31, 2024 | ​ | $ | 355.0 | ​ | ​ | 65.1 | ​ | 115.6 | ​ | 535.7
​

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