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Income Tax Expense (Tables) | 12 Months Ended
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Sep. 30, 2025
Income Tax Expense |
Schedule of income tax expense (benefit) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2025 |  | 2024 |  | 2023
Income tax expense from continuing operations | ​ | $ | 36,554 | ​ | 28,325 | ​ | 24,684
Income tax expense (benefit) from discontinued operations |  | ​ | 57,464 |  | (317) |  | 1,718
Total income expense | ​ | $ | 94,018 |  | 28,008 |  | 26,402
Schedule of components of income from continuing operations before income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2025 |  | 2024 |  | 2023
United States | ​ | $ | 121,169 |  | 101,123 |  | 90,404
Foreign | ​ |  | 31,684 |  | 29,830 |  | 19,964
Total income before income taxes | ​ | $ | 152,853 |  | 130,953 |  | 110,368
Schedule of principal components of income tax expense (benefit) from continuing operations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2025 |  | 2024 |  | 2023
Federal: |  | ​ |  |  |  |  |
Current | ​ | $ | 25,007 |  | 25,584 |  | 21,923
Deferred | ​ |  | (1,185) |  | (7,295) |  | (5,095)
State and local: | ​ |  | ​ |  | ​ |  | ​
Current | ​ |  | 3,935 |  | 3,212 |  | 3,304
Deferred | ​ |  | (228) |  | 17 |  | (950)
Foreign: | ​ |  | ​ |  | ​ |  | ​
Current | ​ |  | 13,109 |  | 8,602 |  | 5,694
Deferred | ​ |  | (4,084) |  | (1,795) |  | (192)
Total | ​ | $ | 36,554 |  | 28,325 |  | 24,684
Schedule of actual income tax expense from continuing operations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2025 |  | 2024 |  | 2023 |
Federal corporate statutory rate |  | 21.0 | % | 21.0 | % | 21.0 | %
State and local, net of Federal benefits | ​ | 2.3 |  | 2.5 |  | 2.1 | ​
Impact of foreign operations | ​ | 1.1 | ​ | 0.4 | ​ | 0.3 | ​
Federal research credit | ​ | (1.1) | ​ | (0.8) | ​ | (0.9) | ​
Executive compensation | ​ | 0.9 |  | 0.2 |  | 1.1 | ​
Valuation allowance | ​ | (0.1) |  | (0.3) |  | 0.3 | ​
U.S. tax on GILTI | ​ | 2.5 | ​ | 2.4 | ​ | 1.3 | ​
GILTI foreign tax credits | ​ | (1.8) | ​ | (2.0) | ​ | (1.0) | ​
FDII deduction | ​ | (1.1) | ​ | (1.7) | ​ | (1.7) | ​
Other, net | ​ | 0.2 |  | (0.1) |  | (0.1) | ​
Effective income tax rate | ​ | 23.9 | % | 21.6 | % | 22.4 | %
Schedule of tax effects of temporary differences that give rise to significant portions of the deferred tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​
(Dollars in thousands) |  | 2025 |  | 2024
Deferred tax assets: |  | ​ |  |  |
Inventories | ​ | $ | 5,589 |  | 4,663
Pension and other postretirement benefits | ​ |  | 417 |  | 460
Capitalized research and development expenditures | ​ | ​ | 14,648 | ​ | 9,726
Lease liabilities | ​ | ​ | 8,571 | ​ | 7,183
Net operating and capital loss carryforwards — domestic | ​ |  | 473 |  | 544
Net operating loss carryforward — foreign | ​ |  | 3,855 |  | 3,855
Other compensation-related costs and other cost accruals | ​ |  | 9,904 |  | 9,289
State credit carryforward | ​ |  | 1,016 |  | 1,601
Total deferred tax assets | ​ |  | 44,473 |  | 37,321
​ | ​ |  | ​ |  | ​
Deferred tax liabilities: | ​ |  | ​ |  | ​
ROU assets | ​ | ​ | (8,906) | ​ | (6,627)
Goodwill | ​ |  | (15,904) |  | (13,353)
Acquisition intangible assets | ​ |  | (107,190) |  | (66,986)
Depreciation, software amortization | ​ |  | (20,359) |  | (17,079)
Net deferred tax liabilities before valuation allowance | ​ |  | (107,886) |  | (66,724)
Less valuation allowance | ​ |  | (1,347) |  | (1,513)
Net deferred tax liabilities | ​ | $ | (109,233) |  | (68,237)

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-9 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-2 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 + Details
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