Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Revenues:
Revenues before reimbursements	$ 125,085	$ 124,959	$ 394,726	$ 383,317
Reimbursements	11,194	8,377	27,022	30,549
Revenues	136,279	133,336	421,748	413,866
Operating expenses:
Compensation and related expenses	81,954	74,011	251,747	241,028
Other operating expenses	11,975	10,997	33,691	30,863
Reimbursable expenses	11,194	8,377	27,022	30,549
General and administrative expenses	5,309	6,018	16,984	18,498
Total operating expenses	110,432	99,403	329,444	320,938
Operating income	25,847	33,933	92,304	92,928
Other income, net:
Interest income, net	2,559	1,858	7,416	5,221
Miscellaneous income (expense), net	7,531	(1,774)	16,322	7,659
Total other income, net	10,090	84	23,738	12,880
Income before income taxes	35,937	34,017	116,042	105,808
Income taxes	9,893	9,479	30,629	26,398
Net income	$ 26,044	$ 24,538	$ 85,413	$ 79,410
Net income per share:
Basic (in dollars per share)	$ 0.51	$ 0.48	$ 1.67	$ 1.55
Diluted (in dollars per share)	$ 0.5	$ 0.48	$ 1.66	$ 1.54
Shares used in per share computations:
Basic (in shares)	51,177	51,203	51,098	51,197
Diluted (in shares)	51,622	51,645	51,527	51,680
Cash dividends declared per common share (in dollars per share)	$ 0.28	$ 0.26	$ 0.84	$ 0.78