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v3.26.1

Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 03, 2026 | Jul. 04, 2025 | Jul. 03, 2026 | Jul. 04, 2025
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 171,612 | $ 141,962 | $ 337,915 | $ 287,469
Compensation and related expenses | 100,571 | 97,474 | 191,980 | 173,377
Operating Income | 28,022 | 17,177 | 69,401 | 61,609
Capital Expenditures | 1,657 | 2,390 | 4,066 | 3,642
Depreciation and Amortization | 2,678 | 2,520 | 5,193 | 5,012
Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Compensation and related expenses | 76,807 | 68,654 | 153,762 | 138,350
Operating Income | 57,165 | 49,962 | 115,965 | 103,773
Capital Expenditures | 537 | 345 | 1,209 | 882
Depreciation and Amortization | 2,027 | 1,885 | 3,921 | 3,758
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Compensation and related expenses | 23,764 | 28,820 | 38,218 | 35,027
Operating Income | (29,143) | (32,785) | (46,564) | (42,164)
Capital Expenditures | 1,120 | 2,045 | 2,857 | 2,760
Depreciation and Amortization | 651 | 635 | 1,272 | 1,254
Engineering and Other Scientific | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 148,829 | 120,980 | 290,241 | 243,115
Compensation and related expenses | 63,862 | 56,914 | 127,920 | 114,162
Operating Income | 49,540 | 42,942 | 99,955 | 88,055
Capital Expenditures | 475 | 306 | 1,107 | 781
Depreciation and Amortization | 1,979 | 1,836 | 3,828 | 3,662
Environmental and Health | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 22,783 | 20,982 | 47,674 | 44,354
Compensation and related expenses | 12,945 | 11,740 | 25,842 | 24,188
Operating Income | 7,625 | 7,020 | 16,010 | 15,718
Capital Expenditures | 62 | 39 | 102 | 101
Depreciation and Amortization | $ 48 | $ 49 | $ 93 | $ 96

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