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Revenue Recognition - Summary of Revenues (Detail) - Sales Revenue, Net [Member] - Revenue from Rights Concentration Risk [Member] | 3 Months Ended | 6 Months Ended
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Jul. 01, 2022 | Jul. 02, 2021 | Jul. 01, 2022 | Jul. 02, 2021
Time And Materials Contracts [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage | 79.00% | 79.00% | 79.00% | 79.00%
Time And Materials Contracts [Member] | Engineering and Other Scientific [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage | 64.00% | 62.00% | 63.00% | 61.00%
Time And Materials Contracts [Member] | Environmental and Health [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage | 15.00% | 17.00% | 16.00% | 18.00%
Fixed Price Contracts [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage | 21.00% | 21.00% | 21.00% | 21.00%
Fixed Price Contracts [Member] | Engineering and Other Scientific [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage | 20.00% | 20.00% | 20.00% | 20.00%
Fixed Price Contracts [Member] | Environmental and Health [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Concentration Risk, Percentage | 1.00% | 1.00% | 1.00% | 1.00%

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