Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 28, 2013	Dec. 28, 2012
Current assets:
Cash and cash equivalents	$ 116,644	$ 113,268
Short-term investments	6,417	20,881
Accounts receivable, net of allowance for doubtful accounts of $2,702 and $2,666 at June 28, 2013 and December 28, 2012, respectively	86,446	85,361
Prepaid expenses and other assets	9,563	8,277
Deferred income taxes	9,053	7,657
Total current assets	228,123	235,444
Property, equipment and leasehold improvements, net	28,763	27,446
Goodwill	8,607	8,607
Deferred income taxes	18,933	18,359
Deferred compensation plan assets	29,323	24,801
Other assets	580	760
Total assets	314,329	315,417
Current liabilities:
Accounts payable and accrued liabilities	5,964	10,386
Accrued payroll and employee benefits	44,614	54,720
Deferred revenues	7,744	6,665
Total current liabilities	58,322	71,771
Other liabilities	1,102	988
Deferred compensation	29,193	24,697
Deferred rent	2,474	1,532
Total liabilities	91,091	98,988
Stockholders' equity:
Common stock, $0.001 par value; 100,000 shares authorized; 16,427 shares issued at June 28, 2013 and December 28, 2012	16	16
Additional paid-in capital	138,706	123,693
Accumulated other comprehensive loss
Investment securities, available for sale	2	24
Foreign currency translation adjustments	(711)	(274)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total	(709)	(250)
Retained earnings	210,585	206,057
Treasury stock, at cost; 3,294 and 3,221 shares held at June 28, 2013 and December 28, 2012, respectively	(125,360)	(113,087)
Total stockholders' equity	223,238	216,429
Total liabilities and stockholders' equity	$ 314,329	$ 315,417