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Segment Information (Detail) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Jan. 01, 2021 | Jan. 03, 2020
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 466,269,000 | $ 399,900,000 | $ 417,199,000
Operating Income | 108,927,000 | 83,249,000 | 85,111,000
Capital Expenditures | 6,637,000 | 5,107,000 | 22,290,000
Depreciation and Amortization | 6,487,000 | 6,871,000 | 6,806,000
Operating segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Income | 168,352,000 | 127,344,000 | 137,411,000
Capital Expenditures | 2,952,000 | 2,339,000 | 4,779,000
Depreciation and Amortization | 4,224,000 | 4,435,000 | 5,033,000
Corporate |  |  |
Segment Reporting Information [Line Items] |  |  |
Operating Income | (59,425,000) | (44,095,000) | (52,300,000)
Capital Expenditures | 3,685,000 | 2,768,000 | 17,511,000
Depreciation and Amortization | 2,263,000 | 2,436,000 | 1,773,000
Engineering and Other Scientific | Operating segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 380,909,000 | 319,346,000 | 339,796,000
Operating Income | 140,400,000 | 100,616,000 | 110,822,000
Capital Expenditures | 2,792,000 | 2,237,000 | 4,675,000
Depreciation and Amortization | 4,031,000 | 4,239,000 | 4,827,000
Environmental and Health | Operating segments |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 85,360,000 | 80,554,000 | 77,403,000
Operating Income | 27,952,000 | 26,728,000 | 26,589,000
Capital Expenditures | 160,000 | 102,000 | 104,000
Depreciation and Amortization | $ 193,000 | $ 196,000 | $ 206,000

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