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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 9 Months Ended
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Jun. 30, 2021
GOODWILL AND OTHER INTANGIBLE ASSETS |
Schedule of goodwill and intangible assets | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | June 30, |  | September 30,
(Dollars in thousands) |  | 2021 |  | 2020
Goodwill | ​ | $ | 411,732 |  | 408,063
​ | ​ |  | ​ | ​ | ​
Intangible assets with determinable lives: | ​ |  | ​ | ​ | ​
Patents | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 2,144 | ​ | 2,092
Less: accumulated amortization | ​ |  | 943 | ​ | 858
Net | ​ | $ | 1,201 | ​ | 1,234
​ | ​ |  | ​ | ​ | ​
Capitalized software | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 91,388 | ​ | 84,888
Less: accumulated amortization | ​ |  | 62,111 | ​ | 57,302
Net | ​ | $ | 29,277 | ​ | 27,586
​ | ​ |  | ​ | ​ | ​
Customer relationships | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 229,385 | ​ | 227,178
Less: accumulated amortization | ​ |  | 76,986 | ​ | 67,643
Net | ​ | $ | 152,399 | ​ | 159,535
​ | ​ |  | ​ | ​ | ​
Other | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 5,358 | ​ | 5,156
Less: accumulated amortization | ​ |  | 3,730 | ​ | 3,260
Net | ​ | $ | 1,628 | ​ | 1,896
Intangible assets with indefinite lives: | ​ |  | ​ | ​ | ​
Trade names | ​ | $ | 158,841 | ​ | 156,381
Schedule of carrying amount of goodwill attributable to each business segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Aerospace | ​ | ​
(Dollars in millions) |  | USG |  | Test |  | & Defense |  | Total
Balance as of September 30, 2020 | ​ | ​ | 271.9 |  | 34.1 |  | 102.1 |  | 408.1
Acquisition activity | ​ | ​ | — | ​ | — | ​ | 2.2 | ​ | 2.2
Foreign currency translation | ​ | ​ | 1.4 | ​ | — | ​ | — | ​ | 1.4
Balance as of June 30, 2021 | ​ | $ | 273.3 | ​ | 34.1 | ​ | 104.3 | ​ | 411.7

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