Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 30, 2022	Dec. 31, 2021	Jan. 01, 2021
Revenues:
Revenues before reimbursements	$ 463,820	$ 434,850	$ 378,412
Reimbursements	49,473	31,419	21,488
Revenues	513,293	466,269	399,900
Operating expenses:
Compensation and related expenses	264,235	278,047	250,041
Other operating expenses	35,083	32,594	32,234
Reimbursable expenses	49,473	31,419	21,488
General and administrative expenses	23,660	15,282	12,888
Total operating expenses	372,451	357,342	316,651
Operating income	140,842	108,927	83,249
Other income:
Interest income	2,096	66	1,705
Miscellaneous income, net	(10,704)	16,844	11,982
Income before income taxes	132,234	125,837	96,936
Provision for income taxes	29,904	24,635	14,384
Net income	$ 102,330	$ 101,202	$ 82,552
Net income per share:
Basic (in dollars per share)	$ 1.98	$ 1.92	$ 1.58
Diluted (in dollars per share)	$ 1.96	$ 1.90	$ 1.55
Shares used in per share computations:
Basic (in shares)	51,727	52,610	52,388
Diluted (in shares)	52,280	53,331	53,323
Cash dividends declared per common share (in dollars per share)	$ 0.96	$ 0.80	$ 0.76