Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2021	Apr. 02, 2021	Apr. 03, 2020
Cash flows from operating activities:
Net income		$ 30,848	$ 26,282
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization of property, equipment and leasehold improvements		1,656	1,786
Amortization of premiums and accretion of discounts on short-term investments		(7)	(60)
Provision for contract losses and doubtful accounts	$ 645	645	2,383
Stock-based compensation		6,282	6,138
Deferred income tax provision		1,226	1,614
Changes in operating assets and liabilities:
Accounts receivable		(13,291)	(9,457)
Prepaid expenses and other current assets		(8,142)	(12,561)
Change in operating leases		(627)	(707)
Accounts payable and accrued liabilities		3,451	(4,110)
Accrued payroll and employee benefits		(17,862)	(24,117)
Deferred revenues		(2,894)	(1,026)
Net cash provided by (used in) operating activities		1,285	(13,835)
Cash flows from investing activities:
Capital expenditures		(2,515)	(1,293)
Purchase of short-term investments		(9,997)
Maturity of short-term investments		25,000	9,000
Net cash provided by investing activities		12,488	7,707
Cash flows from financing activities:
Payroll taxes for restricted stock units		(15,634)	(15,112)
Repurchase of common stock			(40,049)
Exercise of stock-based payment awards		543	1,145
Dividends and dividend equivalents rights		(11,935)	(10,308)
Net cash used in financing activities		(27,026)	(64,324)
Effect of foreign currency exchange rates on cash and cash equivalents		249	(390)
Net decrease in cash and cash equivalents		(13,004)	(70,842)
Cash and cash equivalents at beginning of period		197,525	176,436
Cash and cash equivalents at end of period	$ 184,521	$ 184,521	$ 105,594