Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 02, 2015	Jan. 03, 2014	Dec. 28, 2012
Cash flows from operating activities:
Net income	$ 40,701	$ 38,640	$ 37,225
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property, equipment and leasehold improvements	5,404	4,951	4,711
Amortization of premiums and accretion of discounts on short-term investments	885	340	560
Deferred rent expense	(273)	800	(310)
Provision for doubtful accounts	1,718	1,705	1,763
Stock-based compensation	13,079	13,168	12,378
Deferred income tax provision	(6,077)	(3,398)	(4,194)
Excess tax benefit for equity incentive plans	(5,100)	(4,267)	(3,948)
Changes in operating assets and liabilities:
Accounts receivable	(11,106)	6,676	(14,059)
Prepaid expenses and other assets	(5,320)	(4,596)	(3,379)
Accounts payable and accrued liabilities	6,142	3,002	7,374
Accrued payroll and employee benefits	6,744	4,665	9,667
Deferred revenues	1,455	106	717
Net cash provided by operating activities	48,252	61,792	48,505
Cash flows from investing activities:
Capital expenditures	(4,947)	(6,226)	(4,942)
Purchase of short-term investments	(5,260)	(33,422)	(515)
Maturity of short-term investments	11,642	19,190	3,770
Sale of short-term investments	1,000	1,578	518
Net cash provided by (used in) investing activities	2,435	(18,880)	(1,169)
Cash flows from financing activities:
Excess tax benefit for equity incentive plans	5,100	4,267	3,948
Payroll taxes for restricted stock units	(6,356)	(6,402)	(3,531)
Repurchase of common stock	(30,921)	(25,519)	(22,887)
Exercise of share-based payment awards	2,107	1,812	3,611
Dividends and dividend equivalent rights	(13,058)	(7,927)	0
Net cash used in financing activities	(43,128)	(33,769)	(18,859)
Effect of foreign currency exchange rates on cash and cash equivalents	(1,017)	537	352
Net increase in cash and cash equivalents	6,542	9,680	28,829
Cash and cash equivalents at beginning of year	122,948	113,268	84,439
Cash and cash equivalents at end of year	$ 129,490	$ 122,948	$ 113,268