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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Jan. 02, 2016
Dec. 27, 2014
Dec. 28, 2013
Cash flows from operating activities:      
Net income $ 44,130 $ 37,803 $ 27,641
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 15,090 13,049 12,169
Loss on disposal of property and equipment 214 246 189
Gain on Sale of Investments (3,287) 0 0
Goodwill and Intangible Asset Impairment 0 0 1,988
Stock-based compensation 14,183 13,778 13,409
Increase (Decrease) in Deferred Income Taxes (985) 3,101 (768)
Tax benefit of excess stock-based compensation deductions (1,467) (3,051) (2,406)
Non-cash director deferred compensation 149 49 44
Changes in operating assets and liabilities — (use) source      
Accounts receivable (33,623) (31,708) (9,935)
Unbilled revenue 2,162 (1,758) 340
Inventory (13,978) (2,387) (9,365)
Other assets 203 (2,856) 1,980
Accounts payable 3,786 16,249 (1,743)
Accrued expenses (2,768) 3,695 1,255
Accrued compensation (483) (3,371) 7,751
Deferred revenue and customer advances (584) (1,236) (1,172)
Long term liabilities 3,970 (997) 515
Net cash provided by operating activities 26,712 40,606 41,892
Cash flows from investing activities:      
Additions of property and equipment (9,372) (13,774) (6,829)
Payments for (Proceeds from) Other Investing Activities (1,015) (250) (2,000)
Proceeds from Sale of Other Investments 5,645 0 0
Purchase of investments (17,755) (31,219) (17,946)
Proceeds from Sale and Maturity of Available-for-sale Securities 20,500 16,500 8,044
Proceeds from Sale of Other Productive Assets 0 0 650
Net cash used in investing activities (1,997) (28,743) (18,081)
Cash flows from financing activities:      
Payments Related to Tax Withholding for Share-based Compensation (1,295) (1,626) (1,212)
Proceeds from stock option exercises 6,464 8,943 13,629
Payments for Repurchase of Common Stock (37,393) (1,678) 0
Tax benefit of excess stock-based compensation deductions 1,467 3,051 2,406
Net cash provided by (used in) financing activities (30,757) 8,690 14,823
Net increase (decrease) in cash and cash equivalents (6,042) 20,553 38,634
Cash and cash equivalents, at beginning of period 185,957 165,404 126,770
Cash and cash equivalents, at end of period 179,915 185,957 165,404
Supplemental disclosure of cash flow information      
Cash paid for income taxes 14,341 15,508 7,235
Noncash investing activity, transfer of inventory to property and equipment 157 637 223
Noncash or Part Noncash Acquisition, Fixed Assets Acquired $ 848 $ 3,235 $ 572