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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jan. 03, 2014
Dec. 28, 2012
Dec. 30, 2011
Cash flows from operating activities:      
Net income $ 38,640 $ 37,225 $ 32,695
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization of property, equipment and leasehold improvements 4,951 4,711 4,411
Amortization of premiums and accretion of discounts on short-term investments 340 560 344
Deferred rent expense 800 (310) (417)
Provision for doubtful accounts 1,705 1,763 1,987
Stock-based compensation 13,168 12,378 10,340
Deferred income tax provision (3,398) (4,194) (3,663)
Tax benefit for stock option plans (4,267) (3,948) (2,378)
Changes in operating assets and liabilities:      
Accounts receivable 6,676 (14,059) (3,018)
Prepaid expenses and other assets (4,596) (3,379) (1,929)
Accounts payable and accrued liabilities 3,002 7,374 (997)
Accrued payroll and employee benefits 4,665 9,667 9,404
Deferred revenues 106 717 (183)
Net cash provided by operating activities 61,792 48,505 46,596
Cash flows from investing activities:      
Capital expenditures (6,226) (4,942) (3,835)
Purchase of short-term investments (33,422) (515) (26,599)
Maturity of short-term investments 19,190 3,770 0
Sale of short-term investments 1,578 518 1,080
Net cash used in investing activities (18,880) (1,169) (29,354)
Cash flows from financing activities:      
Tax benefit for stock option plans 4,267 3,948 2,378
Payroll taxes for restricted stock units (6,402) (3,531) (3,527)
Repurchase of common stock (25,519) (22,887) (40,573)
Exercise of share-based payment awards 1,812 3,611 2,378
Dividends and dividend equivalent rights (7,927) 0 0
Net cash used in financing activities (33,769) (18,859) (39,344)
Effect of foreign currency exchange rates on cash and cash equivalents 537 352 (8)
Net increase (decrease) in cash and cash equivalents 9,680 28,829 (22,110)
Cash and cash equivalents at beginning of year 113,268 84,439 106,549
Cash and cash equivalents at end of year $ 122,948 $ 113,268 $ 84,439