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Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 29, 2017 | Sep. 29, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 30, 2016 | Sep. 30, 2016 | Jul. 01, 2016 | Apr. 01, 2016 | Dec. 29, 2017 | Dec. 30, 2016 | Jan. 01, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 88,282 | $ 87,555 | $ 87,840 | $ 84,122 | $ 77,013 | $ 77,612 | $ 77,295 | $ 83,156 | $ 347,799 | [1] | $ 315,076 | [1] | $ 312,832 | [1]
Operating Income | $ 17,795 | $ 19,305 | $ 20,317 | $ 14,634 | $ 14,949 | $ 15,595 | $ 14,931 | $ 16,436 | 72,051 |  | 61,911 |  | 68,933 |
Capital Expenditures |  |  |  |  |  |  |  |  | 4,725 |  | 14,393 |  | 5,379 |
Depreciation and Amortization |  |  |  |  |  |  |  |  | 6,285 |  | 6,131 |  | 5,479 |
Operating segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | 115,791 |  | 99,144 |  | 98,627 |
Capital Expenditures |  |  |  |  |  |  |  |  | 3,866 |  | 4,433 |  | 3,361 |
Depreciation and Amortization |  |  |  |  |  |  |  |  | 4,628 |  | 4,610 |  | 4,101 |
Engineering and Other Scientific |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 277,603 |  | 248,297 |  | 237,959 |
Operating Income |  |  |  |  |  |  |  |  | 93,451 |  | 80,494 |  | 76,817 |
Capital Expenditures |  |  |  |  |  |  |  |  | 3,648 |  | 4,309 |  | 3,197 |
Depreciation and Amortization |  |  |  |  |  |  |  |  | 4,449 |  | 4,429 |  | 3,919 |
Environmental and Health |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 70,196 |  | 66,779 |  | 74,873 |
Operating Income |  |  |  |  |  |  |  |  | 22,340 |  | 18,650 |  | 21,810 |
Capital Expenditures |  |  |  |  |  |  |  |  | 218 |  | 124 |  | 164 |
Depreciation and Amortization |  |  |  |  |  |  |  |  | 179 |  | 181 |  | 182 |
Corporate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | (43,740) |  | (37,233) |  | (29,694) |
Capital Expenditures |  |  |  |  |  |  |  |  | 859 |  | 9,960 |  | 2,018 |
Depreciation and Amortization |  |  |  |  |  |  |  |  | $ 1,657 |  | $ 1,521 |  | $ 1,378 |
[1] | Geographic revenues are allocated based on the location of the client.

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