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Condensed Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended
Apr. 03, 2021
Mar. 28, 2020
Cash flows from operating activities:    
Net income $ 53,383,000 $ 64,456,000
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 8,493,000 6,379,000
Stock-based compensation 12,708,000 11,272,000
Loss on disposal of equipment, intangibles and other assets 29,000 49,000
Provision for credit losses 49,000 94,000
Changes in operating assets and liabilities:    
Decrease (increase) in accounts receivable 6,823,000 (17,105,000)
(Increase) decrease in inventories (915,000) 427,000
Decrease in other current assets 16,326,000 5,469,000
Increase in lease receivable, net (919,000) (1,747,000)
Increase in deferred costs and other contract assets (1,307,000) (796,000)
Increase in other non-current assets (77,000) (51,000)
Decrease in accounts payable (599,000) (7,968,000)
Decrease in accrued compensation (23,343,000) (17,687,000)
(Decrease) increase in accrued liabilities (5,813,000) 1,704,000
Decrease in income tax payable (303,000) (2,041,000)
Decrease in deferred revenue and other contract-related liabilities (5,308,000) (676,000)
Increase in other non-current liabilities 33,000 576,000
Net cash provided by operating activities 59,260,000 42,355,000
Cash flows from investing activities:    
Maturities of short-term investments 0 (70,000,000)
Purchases of property and equipment, net (8,903,000) (37,004,000)
Increase in intangible assets (1,572,000) (1,135,000)
Business combinations, net of cash acquired 0 47,250,000
Net cash used in investing activities (10,475,000) (15,389,000)
Cash flows from financing activities:    
Proceeds from issuance of common stock 5,756,000 13,044,000
Payroll tax withholdings on behalf of employees for vested equity awards (16,691,000) (1,424,000)
Repurchases of common stock (128,917,000) (371,000)
Net cash (used in) provided by financing activities (139,852,000) 11,249,000
Effect of foreign currency exchange rates on cash 279,000 2,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect (90,788,000) 38,217,000
Cash, cash equivalents and restricted cash at end of period 551,992,000 605,916,000
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 554,216,000 $ 606,292,000