CONSOLIDATED STATEMENTS OF NET INCOME AND COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2024	Jul. 01, 2023	Jun. 29, 2024	Jul. 01, 2023
Income Statement [Abstract]
Gross revenues	$ 236,326	$ 222,638	$ 449,621	$ 406,955
Direct costs:
Salaries and wages	61,390	57,079	117,845	105,463
Sub-consultant services	37,342	39,690	68,602	67,304
Other direct costs	14,323	15,569	27,074	27,890
Total direct costs	113,055	112,338	213,521	200,657
Gross profit	123,271	110,300	236,100	206,298
Operating expenses:
Salaries and wages, payroll taxes, and benefits	68,110	58,949	133,544	111,621
General and administrative	21,178	11,551	43,420	29,472
Facilities and facilities related	6,035	5,823	11,996	11,197
Depreciation and amortization	16,068	13,539	30,550	24,585
Total operating expenses	111,391	89,862	219,510	176,875
Income from operations	11,880	20,438	16,590	29,423
Interest expense	(4,606)	(3,648)	(8,797)	(5,229)
Income before income tax expense	7,274	16,790	7,793	24,194
Income tax benefit (expense)	633	(1,377)	522	(2,834)
Net income	$ 7,907	$ 15,413	$ 8,315	$ 21,360
Earnings per share:
Basic (in dollars per share)	$ 0.51	$ 1.03	$ 0.54	$ 1.43
Diluted (in dollars per share)	$ 0.50	$ 1.00	$ 0.53	$ 1.39
Weighted average common shares outstanding:
Basic (in shares)	15,362,825	15,014,106	15,314,988	14,948,796
Diluted (in shares)	15,671,176	15,451,788	15,657,632	15,421,535
Comprehensive income:
Net income	$ 7,907	$ 15,413	$ 8,315	$ 21,360
Foreign currency translation losses, net of tax	(176)	(191)	(677)	(191)
Comprehensive income	$ 7,731	$ 15,222	$ 7,638	$ 21,169