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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Net revenue $ 268,834 $ 243,897 $ 704,297 $ 593,149
Cost of sales 141,865 129,894 380,679 318,456
Gross profit 126,969 114,003 323,618 274,693
Selling, general and administrative 32,532 37,144 92,679 95,747
Research and development 29,974 25,980 88,881 72,505
Asset Impairment Charges 0 35,207 0 35,207
Operating expenses 62,506 98,331 181,560 203,459
Income from operations 64,463 15,672 142,058 71,234
Interest income 3,459 1,751 8,420 4,502
Interest expense (263) (264) (799) (787)
Income before income taxes 67,659 17,159 149,679 74,949
Income tax expense/(benefit) 7,282 (17,657) 122,494 (9,933)
Share of results of equity-method investee, net of tax 121 7 144 7
Net income $ 60,256 $ 34,809 $ 27,041 $ 84,875
Net income per share:        
Basic (in dollars per share) $ 0.87 $ 0.49 $ 0.39 $ 1.20
Diluted (in dollars per share) 0.86 0.48 0.38 1.18
Cash dividends declared per share (in dollars per share) $ 0.12 $ 0 $ 0.12 $ 0
Weighted average shares outstanding:        
Basic (in shares) 69,125 71,063 70,019 70,960
Diluted (in shares) 70,302 72,483 71,113 72,169