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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Sep. 30, 2021
Goodwill and Other Intangible Assets |
Schedule of goodwill and intangible assets | Included on the Consolidated Balance Sheets at September 30, 2021 and 2020 are the following intangible assets gross carrying amounts and accumulated amortization: ​
​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2021 |  | 2020
Goodwill | ​ | $ | 504,853 |  | 408,063
​ | ​ |  | ​ | ​ | ​
Intangible assets with determinable lives: | ​ |  | ​ | ​ | ​
Patents | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 2,131 | ​ | 2,092
Less: accumulated amortization | ​ |  | 972 | ​ | 858
Net | ​ | $ | 1,159 | ​ | 1,234
​ | ​ |  | ​ | ​ | ​
Capitalized software | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 93,671 | ​ | 84,888
Less: accumulated amortization | ​ |  | 63,740 | ​ | 57,302
Net | ​ | $ | 29,931 | ​ | 27,586
​ | ​ |  | ​ | ​ | ​
Customer Relationships | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 288,530 | ​ | 227,178
Less: accumulated amortization | ​ |  | 80,882 | ​ | 67,643
Net | ​ | $ | 207,648 | ​ | 159,535
​ | ​ |  | ​ | ​ | ​
Other | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 8,680 | ​ | 5,156
Less: accumulated amortization | ​ |  | 4,298 | ​ | 3,260
Net | ​ | $ | 4,382 | ​ | 1,896
Intangible assets with indefinite lives: | ​ |  | ​ | ​ | ​
Trade names | ​ | $ | 166,130 | ​ | 156,381
Schedule of carrying amount of goodwill attributable to each business segment | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in millions) |  | A&D | ​ | Test |  | USG |  | Total
Balance as of September 30, 2019 | ​ | $ | 102.2 |  | ​ | 34.1 |  | 254.0 |  | 390.3
Out-of-period adjustment | ​ | ​ | — | ​ | ​ | — | ​ | 18.0 | ​ | 18.0
Foreign currency translation and other | ​ | ​ | (0.1) | ​ | ​ | — | ​ | (0.1) | ​ | (0.2)
Balance as of September 30, 2020 | ​ | $ | 102.1 | ​ | ​ | 34.1 | ​ | 271.9 | ​ | 408.1
Acquisition activity | ​ | ​ | 2.2 | ​ | ​ | — | ​ | 95.2 | ​ | 97.4
Foreign currency translation and other | ​ | ​ | — | ​ | ​ | — | ​ | (0.6) | ​ | (0.6)
Balance as of September 30, 2021 | ​ | $ | 104.3 | ​ | ​ | 34.1 | ​ | 366.5 | ​ | 504.9

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