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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Jan. 02, 2021
Dec. 28, 2019
Dec. 29, 2018
Cash flows from operating activities:      
Net income including noncontrolling interest $ 240,282,000 $ 196,216,000 $ 193,543,000
Adjustments to reconcile net income including noncontrolling interest to net cash provided by operating activities:      
Depreciation and amortization 29,300,000 23,487,000 21,127,000
Stock-based compensation 42,225,000 39,233,000 27,417,000
Loss on disposal of equipment, intangibles and other assets 554,000 357,000 949,000
Provision for doubtful accounts (82,000) (687,000)  
(Benefit) for doubtful accounts     (439,000)
(Benefit) for amount due from former foreign agent 0 0 (2,016,000)
(Benefit) from deferred income taxes (4,964,000) (5,965,000) (8,274,000)
Changes in operating assets and liabilities:      
(Increase) decrease in trade accounts receivable (2,229,000) (23,580,000) 10,826,000
(Increase) in inventories (94,434,000) (21,257,000) (1,885,000)
(Increase) decrease in other current assets (29,984,000) (8,536,000) 3,843,000
(Increase) in lease receivable, net (7,749,000) (11,958,000) 0
(Increase) decrease in deferred costs and other contract assets (2,806,000) 3,308,000 (17,935,000)
(Increase) decrease in other non-current assets (1,320,000) (226,000) 407,000
Increase in accounts payable 7,637,000 9,934,000 5,211,000
Increase in accrued compensation 15,544,000 5,338,000 10,195,000
Increase in deferred revenue and other contract-related liabilities 10,871,000 7,739,000 1,420,000
(Decrease) increase in income taxes payable (1,301,000) 4,079,000 (1,208,000)
Increase in accrued liabilities 9,391,000 746,000 3,923,000
(Decrease) increase in other non-current liabilities (136,000) 2,038,000 (7,577,000)
Net cash provided by operating activities 210,963,000 221,640,000 239,527,000
Cash flows from investing activities:      
Maturities of short-term investments 120,000,000 160,000,000 0
Purchases of short-term investments 0 (280,000,000) 0
Purchases of property and equipment, net (72,549,000) (68,375,000) (17,126,000)
Increase in intangible assets (7,408,000) (4,117,000) (5,557,000)
Business combinations, net of cash acquired 112,706,000 0 3,922,000
Deposit to acquire noncontrolling interest 3,374,000 0 0
Other strategic investing activities (6,750,000) (5,189,000) 453,000
Net cash (used in) investing activities (82,787,000) (197,681,000) (26,152,000)
Cash flows from financing activities:      
Proceeds from issuance of common stock 58,424,000 28,339,000 44,748,000
Repurchases of common stock (110,540,000) (37,555,000) (18,478,000)
Payroll tax withholdings on behalf of employees for stock options (2,191,000) (123,000) (168,000)
Debt issuance costs 0 0 (322,000)
Net cash (used in) provided by financing activities (54,307,000) (9,339,000) 25,780,000
Effect of foreign currency exchange rates on cash 3,060,000 814,000 (1,997,000)
Net increase in cash, cash equivalents and restricted cash 76,929,000 15,434,000 237,158,000
Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 645,004,000 $ 568,075,000 $ 552,641,000