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GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) | 6 Months Ended
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Mar. 31, 2022
GOODWILL AND OTHER INTANGIBLE ASSETS |
Schedule of goodwill and intangible assets | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, |  | September 30,
(Dollars in thousands) |  | 2022 |  | 2021
Goodwill | ​ | $ | 508,406 |  | 504,853
​ | ​ |  | ​ | ​ | ​
Intangible assets with determinable lives: | ​ |  | ​ | ​ | ​
Patents | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 2,208 | ​ | 2,131
Less: accumulated amortization | ​ |  | 1,029 | ​ | 972
Net | ​ | $ | 1,178 | ​ | 1,159
​ | ​ |  | ​ | ​ | ​
Capitalized software | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 98,398 | ​ | 93,671
Less: accumulated amortization | ​ |  | 67,013 | ​ | 63,740
Net | ​ | $ | 31,385 | ​ | 29,931
​ | ​ |  | ​ | ​ | ​
Customer relationships | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 292,887 | ​ | 288,530
Less: accumulated amortization | ​ |  | 88,933 | ​ | 80,882
Net | ​ | $ | 203,954 | ​ | 207,648
​ | ​ |  | ​ | ​ | ​
Other | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 14,567 | ​ | 13,080
Less: accumulated amortization | ​ |  | 5,897 | ​ | 4,301
Net | ​ | $ | 8,670 | ​ | 8,779
Intangible assets with indefinite lives: | ​ |  | ​ | ​ | ​
Trade names | ​ | $ | 162,016 | ​ | 161,733
Schedule of carrying amount of goodwill attributable to each business segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Aerospace | ​ | ​
(Dollars in millions) |  | USG | ​ | Test |  | & Defense |  | Total
Balance as of September 30, 2021 | ​ | ​ | 366.5 |  | ​ | 34.1 |  | 104.3 |  | 504.9
Acquisition activity and adjustments | ​ | ​ | 0.3 | ​ | ​ | — | ​ | 5.7 | ​ | 6.0
Foreign currency translation | ​ | ​ | (2.5) | ​ | ​ | — | ​ | — | ​ | (2.5)
Balance as of March 31, 2022 | ​ | $ | 364.3 | ​ | ​ | 34.1 | ​ | 110.0 | ​ | 508.4

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