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Goodwill and Other Intangible Assets | 12 Months Ended
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Sep. 30, 2020
Goodwill and Other Intangible Assets |
Goodwill and Other Intangible Assets | 4. Goodwill and Other Intangible Assets Included on the Company’s Consolidated Balance Sheets at September 30, 2020 and 2019 are the following intangible assets gross carrying amounts and accumulated amortization: ​
​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2020 |  | 2019
Goodwill | ​ | $ | 408,063 |  | 390,256
​ | ​ |  | ​ | ​ | ​
Intangible assets with determinable lives: | ​ |  | ​ | ​ | ​
Patents | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 2,092 | ​ | 1,945
Less: accumulated amortization | ​ |  | 858 | ​ | 748
Net | ​ | $ | 1,234 | ​ | 1,197
​ | ​ |  | ​ | ​ | ​
Capitalized software | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 84,888 | ​ | 78,962
Less: accumulated amortization | ​ |  | 57,302 | ​ | 48,530
Net | ​ | $ | 27,586 | ​ | 30,432
​ | ​ |  | ​ | ​ | ​
Customer Relationships | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 227,178 | ​ | 227,225
Less: accumulated amortization | ​ |  | 67,643 | ​ | 55,326
Net | ​ | $ | 159,535 | ​ | 171,899
​ | ​ |  | ​ | ​ | ​
Other | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 5,156 | ​ | 5,441
Less: accumulated amortization | ​ |  | 3,260 | ​ | 2,645
Net | ​ | $ | 1,896 | ​ | 2,796
Intangible assets with indefinite lives: | ​ |  | ​ | ​ | ​
Trade names | ​ | $ | 156,381 | ​ | 175,281
​ The Company performed its annual evaluation of goodwill and intangible assets for impairment during the fourth quarter of 2020 and concluded no impairment existed at September 30, 2020 and there are no accumulated impairment losses as of September 30, 2020. The changes in the carrying amount of goodwill attributable to each business segment for 2020 and 2019 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Aerospace & | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in millions) |  | Defense |  | Test |  | USG |  | Total
Balance as of September 30, 2018 | ​ | ​ | 73.7 |  | ​ | 34.1 |  | 254.1 |  | 361.9
Acquisition activity and other | ​ |  | 28.5 |  | ​ | — |  | (0.1) |  | 28.4
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
​ As of September 30, 2020, the Company reclassified $18.0 million from Morgan Schaffer’s tradename to goodwill to correct a misclassification that originated in the original accounting for the acquisition in fiscal 2017. Management has determined that the effect of this misclassification was not material to the current or any prior periods and it had no impact on the Company’s total assets, results of operations or cash flows for any period. Amortization expense related to intangible assets with determinable lives was $21.8 million, $18.5 million and $17.3 million in 2020, 2019 and 2018, respectively. Patents are amortized over the life of the patents, generally 17 years. Capitalized software is amortized over the estimated useful life of the software, generally three to seven years. Customer relationships are generally amortized over fifteen to twenty years. Intangible asset amortization for fiscal years 2021 through 2025 is estimated at approximately $21 million per year.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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