Consolidated Statements of Net Income and Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Income Statement [Abstract]
Gross revenues	$ 162,689	$ 127,974	$ 328,169	$ 245,309
Direct costs:
Salaries and wages	45,079	38,080	90,114	73,337
Sub-consultant services	25,244	20,044	52,670	36,996
Other direct costs	8,914	8,410	17,402	18,106
Total direct costs	79,237	66,534	160,186	128,439
Gross Profit	83,452	61,440	167,983	116,870
Operating Expenses:
Salaries and wages, payroll taxes and benefits	44,149	30,765	89,706	60,004
General and administrative	11,824	10,896	24,980	19,758
Facilities and facilities related	5,357	3,937	10,754	7,743
Depreciation and amortization	11,160	6,245	22,200	12,357
Total operating expenses	72,490	51,843	147,640	99,862
Income from operations	10,962	9,597	20,343	17,008
Interest expense	(4,403)	(457)	(8,190)	(808)
Income before income tax expense	6,559	9,140	12,153	16,200
Income tax expense	(2,056)	(346)	(3,462)	(1,863)
Net Income and Comprehensive Income	$ 4,503	$ 8,794	$ 8,691	$ 14,337
Earnings per share:
Basic (in dollars per Share)	$ 0.37	$ 0.73	$ 0.71	$ 1.19
Diluted (in dollars per Share)	$ 0.36	$ 0.70	$ 0.69	$ 1.15
Weighted average common shares outstanding:
Basic (in shares)	12,308,965	12,106,066	12,271,221	12,033,906
Diluted (in shares)	12,609,918	12,521,463	12,601,830	12,447,248