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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 9 Months Ended
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Jun. 30, 2023
GOODWILL AND OTHER INTANGIBLE ASSETS |
Schedule of intangible assets gross carrying amounts and accumulated amortization | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | September 30,
(Dollars in thousands) |  | 2023 |  | 2022
Goodwill | ​ | $ | 505,590 |  | 492,709
​ | ​ |  | ​ | ​ | ​
Intangible assets with determinable lives: | ​ |  | ​ | ​ | ​
Patents | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 2,433 | ​ | 2,353
Less: accumulated amortization | ​ |  | 1,186 | ​ | 1,091
Net | ​ | $ | 1,247 | ​ | 1,262
​ | ​ |  | ​ | ​ | ​
Capitalized software | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 118,529 | ​ | 106,583
Less: accumulated amortization | ​ |  | 77,308 | ​ | 70,476
Net | ​ | $ | 41,221 | ​ | 36,107
​ | ​ |  | ​ | ​ | ​
Customer relationships | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 298,110 | ​ | 287,447
Less: accumulated amortization | ​ |  | 109,186 | ​ | 96,921
Net | ​ | $ | 188,924 | ​ | 190,526
​ | ​ |  | ​ | ​ | ​
Other | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 14,345 | ​ | 13,985
Less: accumulated amortization | ​ |  | 9,271 | ​ | 7,440
Net | ​ | $ | 5,074 | ​ | 6,545
Intangible assets with indefinite lives: | ​ |  | ​ | ​ | ​
Trade names | ​ | $ | 161,952 | ​ | 160,024
Schedule of carrying amount of goodwill attributable to each business segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Aerospace | ​ | ​
(Dollars in millions) |  | USG |  | Test |  | & Defense |  | Total
Balance as of September 30, 2022 | ​ | $ | 348.7 |  | ​ | 34.0 |  | 110.0 |  | 492.7
Acquisition activity and adjustments | ​ | ​ | — | ​ | ​ | — | ​ | 5.6 | ​ | 5.6
Foreign currency translation | ​ | ​ | 7.3 | ​ | ​ | — | ​ | — | ​ | 7.3
Balance as of June 30, 2023 | ​ | $ | 356.0 | ​ | ​ | 34.0 | ​ | 115.6 | ​ | 505.6

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