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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Sep. 30, 2025
Goodwill and Other Intangible Assets |
Schedule of 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
Schedule of carrying amount of goodwill attributable to each business segment from continuing operations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(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

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