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Goodwill and Other Intangible Assets | 12 Months Ended
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Sep. 30, 2025
Goodwill and Other Intangible Assets |
Goodwill and Other Intangible Assets | 4. Goodwill and Other Intangible Assets ​ Included on the Consolidated Balance Sheets at September 30, 2025 and 2024 are the following intangible assets gross carrying amounts and accumulated amortization from continuing operations: ​
​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2025 |  | 2024
Goodwill | ​ | $ | 761,931 | ​ | 529,935
​ | ​ |  | ​ | ​ | ​
Intangible assets with determinable lives: | ​ |  | ​ | ​ | ​
Patents | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 7,607 | ​ | 2,638
Less: accumulated amortization | ​ |  | 1,775 | ​ | 1,415
Net | ​ | $ | 5,832 | ​ | 1,223
​ | ​ |  | ​ | ​ | ​
Capitalized software | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 138,144 | ​ | 126,721
Less: accumulated amortization | ​ |  | 100,818 | ​ | 89,558
Net | ​ | $ | 37,326 | ​ | 37,163
​ | ​ |  | ​ | ​ | ​
Customer Relationships | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 625,535 | ​ | 330,328
Less: accumulated amortization | ​ |  | 159,543 | ​ | 132,135
Net | ​ | $ | 465,992 | ​ | 198,193
​ | ​ |  | ​ | ​ | ​
Other | ​ |  | ​ | ​ | ​
Gross carrying amount | ​ | $ | 76,991 | ​ | 15,182
Less: accumulated amortization | ​ |  | 24,829 | ​ | 11,173
Net | ​ | $ | 52,162 | ​ | 4,009
Intangible assets with indefinite lives: | ​ |  | ​ | ​ | ​
Trade names | ​ | $ | 162,661 | ​ | 162,936
​ We performed our annual evaluation of goodwill and intangible assets for impairment during the fourth quarter of 2025 and concluded that no impairment existed at September 30, 2025. There were no accumulated impairment losses as of September 30, 2025. The changes in the carrying amount of goodwill attributable to each business segment from continuing operations for 2025 and 2024 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in millions) |  | A&D |  | Test |  | USG |  | Total
Balance as of September 30, 2023 | ​ | $ | 105.6 | ​ | ​ | 34.0 | ​ | 353.6 | ​ | 493.2
Acquisition activity | ​ | ​ | — | ​ | ​ | 30.9 | ​ | — | ​ | 30.9
Foreign currency translation and other | ​ | ​ | — | ​ | ​ | 2.5 | ​ | 3.3 | ​ | 5.8
Balance as of September 30, 2024 | ​ | $ | 105.6 | ​ | ​ | 67.4 | ​ | 356.9 | ​ | 529.9
Acquisition activity | ​ | ​ | 226.5 | ​ | ​ | — | ​ | — | ​ | 226.5
Foreign currency translation and other | ​ | ​ | 1.9 | ​ | ​ | 0.4 | ​ | 3.2 | ​ | 5.5
Balance as of September 30, 2025 | ​ | $ | 334.0 | ​ | ​ | 67.8 | ​ | 360.1 | ​ | 761.9
​ Amortization expense related to intangible assets with determinable lives was $53.3 million, $32.8 million and $29.0 million in 2025, 2024 and 2023, respectively. Patents are amortized over the life of the patents, generally ten to twenty years. Capitalized software is amortized over the estimated useful life of the software, generally three to seven years. Customer relationships are generally amortized over thirteen to twenty years. Intangible asset amortization for fiscal years 2026 through 2030 is estimated as follows: approximately $80 million in 2026, approximately $67 million in 2027, and approximately $46 million in 2028 - 2030. The weighted-average amortization period of the acquired intangible assets subject to amortization is twelve years.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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