Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2022	Apr. 02, 2021
Cash flows from operating activities:
Net income	$ 29,609	$ 30,848
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization of property, equipment and leasehold improvements	1,689	1,656
Amortization of premiums and accretion of discounts on short-term investments		(7)
Provision for contract losses and doubtful accounts	686	645
Stock-based compensation	6,870	6,282
Deferred income tax provision	45	1,226
Changes in operating assets and liabilities:
Accounts receivable	(8,333)	(13,291)
Prepaid expenses and other current assets	(9,948)	(8,142)
Change in operating leases	(535)	(627)
Accounts payable and accrued liabilities	5,234	3,451
Accrued payroll and employee benefits	(27,576)	(17,862)
Deferred revenues	(4,093)	(2,894)
Net cash provided by (used in) operating activities	(6,352)	1,285
Cash flows from investing activities:
Capital expenditures	(2,606)	(2,515)
Purchase of short-term investments		(9,997)
Maturity of short-term investments		25,000
Net cash provided by (used in) investing activities	(2,606)	12,488
Cash flows from financing activities:
Payroll taxes for restricted stock units	(12,904)	(15,634)
Repurchase of common stock	(48,554)
Exercise of stock-based payment awards	564	543
Dividends and dividend equivalents rights	(12,514)	(11,935)
Net cash used in financing activities	(73,408)	(27,026)
Effect of foreign currency exchange rates on cash and cash equivalents	(271)	249
Net decrease in cash and cash equivalents	(82,637)	(13,004)
Cash and cash equivalents at beginning of period	297,687	197,525
Cash and cash equivalents at end of period	$ 215,050	$ 184,521