Revenue Recognition (Tables)

12 Months Ended

Jan. 01, 2021

Revenue From Contract With Customer [Abstract]

Summary of Percent of Revenues

The following table discloses the percent of the Company’s revenue generated from time and materials contracts:

	Fiscal Years
	2020	2019	2018
Engineering & other scientific	61%	66%	64%
Environmental and health	19%	18%	18%
Total time and materials revenues	80%	84%	82%

The following table discloses the percent of the Company’s revenue generated from fixed price contracts:  

	Fiscal Years
	2020	2019	2018
Engineering & other scientific	19%	15%	17%
Environmental and health	1%	1%	1%
Total fixed price revenues	20%	16%	18%