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Revenue Recognition- Summary of Revenues (Detail) - Sales Revenue, Net [Member] - Revenue from Rights Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2021	Jan. 01, 2021	Jan. 03, 2020
Time And Materials Contracts [Member]
Disaggregation Of Revenue [Line Items]
Fiscal Years	78.00%	80.00%	84.00%
Time And Materials Contracts [Member] | Engineering and Other Scientific [Member]
Disaggregation Of Revenue [Line Items]
Fiscal Years	61.00%	61.00%	66.00%
Time And Materials Contracts [Member] | Environmental and Health [Member]
Disaggregation Of Revenue [Line Items]
Fiscal Years	17.00%	19.00%	18.00%
Fixed Price Contracts [Member]
Disaggregation Of Revenue [Line Items]
Fiscal Years	22.00%	20.00%	16.00%
Fixed Price Contracts [Member] | Engineering and Other Scientific [Member]
Disaggregation Of Revenue [Line Items]
Fiscal Years	21.00%	19.00%	15.00%
Fixed Price Contracts [Member] | Environmental and Health [Member]
Disaggregation Of Revenue [Line Items]
Fiscal Years	1.00%	1.00%	1.00%

X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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