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Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 01, 2022 | Jul. 02, 2021 | Jul. 01, 2022 | Jul. 02, 2021
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 130,281 | $ 119,877 | $ 258,759 | $ 236,358
Operating Income | 45,277 | 29,372 | 81,994 | 53,430
Capital Expenditures | 4,656 | 1,499 | 7,451 | 3,805
Depreciation and Amortization | 1,812 | 1,642 | 3,501 | 3,298
Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income | 46,878 | 45,409 | 93,203 | 87,384
Capital Expenditures | 1,622 | 844 | 2,236 | 1,497
Depreciation and Amortization | 1,195 | 1,023 | 2,276 | 2,079
Corporate |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Operating Income | (1,601) | (16,037) | (11,209) | (33,954)
Capital Expenditures | 3,034 | 655 | 5,215 | 2,308
Depreciation and Amortization | 617 | 619 | 1,225 | 1,219
Engineering and Other Scientific | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 109,150 | 98,139 | 213,765 | 191,748
Operating Income | 40,032 | 37,914 | 78,522 | 71,970
Capital Expenditures | 1,616 | 814 | 2,180 | 1,418
Depreciation and Amortization | 1,154 | 976 | 2,193 | 1,986
Environmental and Health | Operating segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 21,131 | 21,738 | 44,994 | 44,610
Operating Income | 6,846 | 7,495 | 14,681 | 15,414
Capital Expenditures | 6 | 30 | 56 | 79
Depreciation and Amortization | $ 41 | $ 47 | $ 83 | $ 93

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