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Segment Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 30, 2016 | Sep. 30, 2016 | Jul. 01, 2016 | Apr. 01, 2016 | Jan. 01, 2016 | Oct. 02, 2015 | Jul. 03, 2015 | Apr. 03, 2015 | Dec. 30, 2016 | Jan. 01, 2016 | Jan. 02, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 77,013 | $ 77,612 | $ 77,295 | $ 83,156 | $ 73,681 | $ 78,994 | $ 79,864 | $ 80,293 | $ 315,076 | [1] | $ 312,832 | [1] | $ 304,704 | [1]
Operating Income | $ 14,949 | $ 15,595 | $ 14,931 | $ 16,436 | $ 14,279 | $ 20,921 | $ 18,705 | $ 15,028 | 61,911 |  | 68,933 |  | 63,549 |
Capital Expenditures |  |  |  |  |  |  |  |  | 14,393 |  | 5,379 |  | 4,947 |
Depreciation and Amortization |  |  |  |  |  |  |  |  | 6,131 |  | 5,479 |  | 5,404 |
Operating segments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | 99,144 |  | 98,627 |  | 97,352 |
Capital Expenditures |  |  |  |  |  |  |  |  | 4,433 |  | 3,361 |  | 3,930 |
Depreciation and Amortization |  |  |  |  |  |  |  |  | 4,610 |  | 4,101 |  | 3,834 |
Engineering and Other Scientific |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 248,297 |  | 237,959 |  | 223,384 |
Operating Income |  |  |  |  |  |  |  |  | 80,494 |  | 76,817 |  | 72,207 |
Capital Expenditures |  |  |  |  |  |  |  |  | 4,309 |  | 3,197 |  | 3,719 |
Depreciation and Amortization |  |  |  |  |  |  |  |  | 4,429 |  | 3,919 |  | 3,637 |
Environmental and Health |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 66,779 |  | 74,873 |  | 81,320 |
Operating Income |  |  |  |  |  |  |  |  | 18,650 |  | 21,810 |  | 25,145 |
Capital Expenditures |  |  |  |  |  |  |  |  | 124 |  | 164 |  | 211 |
Depreciation and Amortization |  |  |  |  |  |  |  |  | 181 |  | 182 |  | 197 |
Corporate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Income |  |  |  |  |  |  |  |  | (37,233) |  | (29,694) |  | (33,803) |
Capital Expenditures |  |  |  |  |  |  |  |  | 9,960 |  | 2,018 |  | 1,017 |
Depreciation and Amortization |  |  |  |  |  |  |  |  | $ 1,521 |  | $ 1,378 |  | $ 1,570 |
[1] | Geographic revenues are allocated based on the location of the client.

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