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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
Income Statement [Abstract]      
Net revenue $ 889,121 $ 809,041 $ 627,192
Cost of sales 479,680 426,947 346,156
Gross profit 409,441 382,094 281,036
Selling, general and administrative 123,188 133,601 134,709
Research and development 119,621 100,203 92,374
Impairment charges 0 35,207 0
Operating expenses 242,809 269,011 227,083
Income from operations 166,632 113,083 53,953
Interest income 11,971 6,491 3,318
Interest expense (1,054) (1,059) (1,107)
Income from operations before income taxes 177,549 118,515 56,164
Income tax expense / (benefit) 120,744 (7,394) 7,709
Share of results of equity-method investee, net of tax 129 (190) 0
Net income $ 56,676 $ 126,099 $ 48,455
Net income per share:      
Basic (in dollars per share) $ 0.82 [1] $ 1.78 $ 0.69
Diluted (in dollars per share) 0.80 [1] 1.75 0.68
Common Stock, Dividends, Per Share, Declared $ 0.24 $ 0.00 $ 0.00
Weighted average shares outstanding:      
Basic (in shares) 69,380 70,906 70,477
Diluted (in shares) 70,419 72,063 70,841
[1] EPS for the year may not equal the sum of quarterly EPS due to changes in weighted share calculations.