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Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 28, 2024 | Jun. 30, 2023 | Jun. 28, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 140,536 | $ 140,221 | $ 285,469 | $ 280,530
Operating Income | 35,744 | 29,875 | 66,457 | 58,995
Capital Expenditures | 1,007 | 9,567 | 2,516 | 15,428
Depreciation and Amortization | 2,486 | 2,186 | 4,810 | 4,174
Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income | 51,024 | 46,232 | 107,891 | 97,405
Capital Expenditures | 510 | 1,280 | 956 | 2,783
Depreciation and Amortization | 1,819 | 1,426 | 3,496 | 2,780
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income | (15,280) | (16,357) | (41,434) | (38,410)
Capital Expenditures | 497 | 8,287 | 1,560 | 12,645
Depreciation and Amortization | 667 | 760 | 1,314 | 1,394
Engineering and Other Scientific | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 118,477 | 116,647 | 239,948 | 233,695
Operating Income | 43,765 | 38,711 | 92,396 | 82,330
Capital Expenditures | 465 | 1,261 | 882 | 2,669
Depreciation and Amortization | 1,765 | 1,372 | 3,393 | 2,678
Environmental and Health | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 22,059 | 23,574 | 45,521 | 46,835
Operating Income | 7,259 | 7,521 | 15,495 | 15,075
Capital Expenditures | 45 | 19 | 74 | 114
Depreciation and Amortization | $ 54 | $ 54 | $ 103 | $ 102

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