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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Mar. 31, 2018
Apr. 01, 2017
Income Statement [Abstract]        
Net revenue $ 221,772 $ 199,613 $ 435,463 $ 349,252
Cost of sales 122,325 107,350 238,814 188,562
Gross profit 99,447 92,263 196,649 160,690
Selling, general and administrative 32,354 30,740 60,147 58,603
Research and development 28,657 25,020 58,907 46,525
Operating expenses 61,011 55,760 119,054 105,128
Income from operations 38,436 36,503 77,595 55,562
Interest income 2,986 1,579 4,961 2,751
Interest expense (270) (261) (536) (523)
Income before income taxes 41,152 37,821 82,020 57,790
Income tax expense 4,800 5,151 115,212 7,724
Share of results of equity-method investee, net of tax 39 0 23 0
Net income/(loss) $ 36,313 $ 32,670 $ (33,215) $ 50,066
Net income/(loss) per share:        
Basic (in dollars per share) $ 0.52 $ 0.46 $ (0.47) $ 0.71
Diluted (in dollars per share) $ 0.51 $ 0.45 $ (0.47) $ 0.69
Weighted average shares outstanding:        
Basic (in shares) 70,361 70,964 70,467 70,909
Diluted (in shares) 71,425 72,270 70,467 72,039