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Revenue Recognition- Summary of Revenues (Detail) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 02, 2021 | Jul. 03, 2020 | Jul. 02, 2021 | Jul. 03, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage | 14.00% | 11.00% | 12.00% |
Time And Materials Contracts [Member] | Sales Revenue, Net [Member] | Revenue from Rights Concentration Risk [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage | 79.00% | 81.00% | 79.00% | 83.00%
Time And Materials Contracts [Member] | Engineering and Other Scientific [Member] | Sales Revenue, Net [Member] | Revenue from Rights Concentration Risk [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage | 62.00% | 60.00% | 61.00% | 63.00%
Time And Materials Contracts [Member] | Environmental and Health [Member] | Sales Revenue, Net [Member] | Revenue from Rights Concentration Risk [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage | 17.00% | 21.00% | 18.00% | 20.00%
Fixed Price Contracts [Member] | Sales Revenue, Net [Member] | Revenue from Rights Concentration Risk [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage | 21.00% | 19.00% | 21.00% | 17.00%
Fixed Price Contracts [Member] | Engineering and Other Scientific [Member] | Sales Revenue, Net [Member] | Revenue from Rights Concentration Risk [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage | 20.00% | 18.00% | 20.00% | 16.00%
Fixed Price Contracts [Member] | Environmental and Health [Member] | Sales Revenue, Net [Member] | Revenue from Rights Concentration Risk [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage | 1.00% | 1.00% | 1.00% | 1.00%

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