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Segment Reporting (Tables) | 6 Months Ended
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Jul. 03, 2026
Segment Reporting [Abstract] |
Segment Reporting Information, by Segment | Segment information for the three and six months ended July 3, 2026 and July 4, 2025 follows: Revenues
|  | Three Months Ended |  |  | Six Months Ended |
(In thousands) |  | July 3, 2026 |  |  | July 4, 2025 |  |  | July 3, 2026 |  |  | July 4, 2025 |
Engineering and Other Scientific |  | $ | 148,829 |  |  | $ | 120,980 |  |  | $ | 290,241 |  |  | $ | 243,115 |
Environmental and Health |  |  | 22,783 |  |  |  | 20,982 |  |  |  | 47,674 |  |  |  | 44,354 |
Total revenues |  | $ | 171,612 |  |  | $ | 141,962 |  |  | $ | 337,915 |  |  | $ | 287,469 |
Compensation and related expenses
|  | Three Months Ended |  |  | Six Months Ended |
(In thousands) |  | July 3, 2026 |  |  | July 4, 2025 |  |  | July 3, 2026 |  |  | July 4, 2025 |
Engineering and Other Scientific |  | $ | 63,862 |  |  | $ | 56,914 |  |  | $ | 127,920 |  |  | $ | 114,162 |
Environmental and Health |  |  | 12,945 |  |  |  | 11,740 |  |  |  | 25,842 |  |  |  | 24,188 |
Total segment compensation and related expenses |  |  | 76,807 |  |  |  | 68,654 |  |  |  | 153,762 |  |  |  | 138,350 |
Corporate compensation and related expenses |  |  | 23,764 |  |  |  | 28,820 |  |  |  | 38,218 |  |  |  | 35,027 |
Total compensation and related expenses |  | $ | 100,571 |  |  | $ | 97,474 |  |  | $ | 191,980 |  |  | $ | 173,377 |
Operating Income
|  | Three Months Ended |  |  | Six Months Ended |
(In thousands) |  | July 3, 2026 |  |  | July 4, 2025 |  |  | July 3, 2026 |  |  | July 4, 2025 |
Engineering and Other Scientific |  | $ | 49,540 |  |  | $ | 42,942 |  |  | $ | 99,955 |  |  | $ | 88,055 |
Environmental and Health |  |  | 7,625 |  |  |  | 7,020 |  |  |  | 16,010 |  |  |  | 15,718 |
Total segment operating income |  |  | 57,165 |  |  |  | 49,962 |  |  |  | 115,965 |  |  |  | 103,773 |
Corporate operating expense |  |  | (29,143 | ) |  |  | (32,785 | ) |  |  | (46,564 | ) |  |  | (42,164 | )
Total operating income |  | $ | 28,022 |  |  | $ | 17,177 |  |  | $ | 69,401 |  |  | $ | 61,609 |
Certain operating expenses are excluded from the Company’s measure of segment operating income. These expenses include costs associated with its human resources, legal, finance, information technology, and business development groups; the deferred compensation expense/benefit due to the change in value of assets associated with its deferred compensation plan; stock-based compensation associated with restricted stock unit and stock option awards; and the change in its allowance for contract losses and doubtful accounts. Capital Expenditures
|  | Three Months Ended |  |  | Six Months Ended |
(In thousands) |  | July 3, 2026 |  |  | July 4, 2025 |  |  | July 3, 2026 |  |  | July 4, 2025 |
Engineering and Other Scientific |  | $ | 475 |  |  | $ | 306 |  |  | $ | 1,107 |  |  | $ | 781 |
Environmental and Health |  |  | 62 |  |  |  | 39 |  |  |  | 102 |  |  |  | 101 |
Total segment capital expenditures |  |  | 537 |  |  |  | 345 |  |  |  | 1,209 |  |  |  | 882 |
Corporate capital expenditures |  |  | 1,120 |  |  |  | 2,045 |  |  |  | 2,857 |  |  |  | 2,760 |
Total capital expenditures |  | $ | 1,657 |  |  | $ | 2,390 |  |  | $ | 4,066 |  |  | $ | 3,642 |
Certain capital expenditures associated with the Company’s corporate cost centers and the related depreciation are excluded from the Company’s segment information. Depreciation and Amortization
|  | Three Months Ended |  |  | Six Months Ended |
(In thousands) |  | July 3, 2026 |  |  | July 4, 2025 |  |  | July 3, 2026 |  |  | July 4, 2025 |
Engineering and Other Scientific |  | $ | 1,979 |  |  | $ | 1,836 |  |  | $ | 3,828 |  |  | $ | 3,662 |
Environmental and Health |  |  | 48 |  |  |  | 49 |  |  |  | 93 |  |  |  | 96 |
Total segment depreciation and amortization |  |  | 2,027 |  |  |  | 1,885 |  |  |  | 3,921 |  |  |  | 3,758 |
Corporate depreciation and amortization |  |  | 651 |  |  |  | 635 |  |  |  | 1,272 |  |  |  | 1,254 |
Total depreciation and amortization |  | $ | 2,678 |  |  | $ | 2,520 |  |  | $ | 5,193 |  |  | $ | 5,012 |

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- Definition Tabular disclosure of segment reporting. Includes, but is not limited to, reconciliation of reportable segment amount to corresponding consolidated total. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 31 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-31 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-34 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 26C -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-26C Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 26B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-26B Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 26A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-26A Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-15 + Details
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