Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Jan. 01, 2021	Jan. 03, 2020
Revenues:
Revenues before reimbursements	$ 434,850	$ 378,412	$ 391,390
Reimbursements	31,419	21,488	25,809
Revenues	466,269	399,900	417,199
Operating expenses:
Compensation and related expenses	278,047	250,041	252,197
Other operating expenses	32,594	32,234	33,562
Reimbursable expenses	31,419	21,488	25,809
General and administrative expenses	15,282	12,888	20,520
Total operating expenses	357,342	316,651	332,088
Operating income	108,927	83,249	85,111
Other income:
Interest income	66	1,705	3,912
Miscellaneous income, net	16,844	11,982	15,167
Income before income taxes	125,837	96,936	104,190
Provision for income taxes	24,635	14,384	21,730
Net income	$ 101,202	$ 82,552	$ 82,460
Net income per share:
Basic (in dollars per share)	$ 1.92	$ 1.58	$ 1.56
Diluted (in dollars per share)	$ 1.90	$ 1.55	$ 1.53
Shares used in per share computations:
Basic (in shares)	52,610	52,388	52,691
Diluted (in shares)	53,331	53,323	53,884
Cash dividends declared per common share (in dollars per share)	$ 0.80	$ 0.76	$ 0.64