Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Jan. 01, 2021	Jan. 03, 2020	Dec. 28, 2018
Cash flows from operating activities:
Net income	$ 82,552,000	$ 82,460,000	$ 72,254,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property, equipment and leasehold improvements	6,871,000	6,806,000	6,292,000
Amortization of premiums and accretion of discounts on short-term investments	(163,000)	(516,000)	(114,000)
Deferred rent expense			175,000
Provision for contract losses and doubtful accounts	1,849,000	2,224,000	1,848,000
Stock-based compensation	17,278,000	17,466,000	16,993,000
Deferred income tax provision	(3,639,000)	(2,845,000)	(3,715,000)
Changes in operating assets and liabilities:
Accounts receivable	6,724,000	(16,548,000)	2,438,000
Prepaid expenses and other current assets	(9,075,000)	(3,343,000)	(11,047,000)
Change in operating leases	(91,000)	205,000
Accounts payable and accrued liabilities	(2,646,000)	6,715,000	(4,620,000)
Accrued payroll and employee benefits	4,562,000	11,891,000	9,820,000
Deferred revenues	(910,000)	3,544,000	864,000
Net cash provided by operating activities	103,312,000	108,059,000	91,188,000
Cash flows from investing activities:
Capital expenditures	(4,987,000)	(23,038,000)	(16,298,000)
Purchase of short-term investments	(39,989,000)	(38,693,000)	(52,522,000)
Maturity of short-term investments	50,000,000	66,000,000	43,000,000
Net cash provided by/(used in) investing activities	5,024,000	4,269,000	(25,820,000)
Cash flows from financing activities:
Payroll taxes for restricted stock units	(15,263,000)	(11,183,000)	(8,839,000)
Repurchase of common stock	(40,049,000)	(21,957,000)	(27,915,000)
Exercise of stock-based payment awards	6,732,000	3,229,000	1,474,000
Dividends and dividend equivalent rights	(39,775,000)	(33,503,000)	(27,220,000)
Net cash used in financing activities	(88,355,000)	(63,414,000)	(62,500,000)
Effect of foreign currency exchange rates on cash and cash equivalents	1,108,000	463,000	(603,000)
Net increase in cash and cash equivalents	21,089,000	49,377,000	2,265,000
Cash and cash equivalents at beginning of year	176,436,000	127,059,000	124,794,000
Cash and cash equivalents at end of year	$ 197,525,000	$ 176,436,000	$ 127,059,000