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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Mar. 30, 2019
Mar. 31, 2018
Revenues $ 115,908 $ 221,772 $ 273,116 $ 435,463
Cost of sales 60,335 122,325 142,744 238,814
Gross profit 55,573 99,447 130,372 196,649
Selling, general and administrative 28,461 32,354 58,902 60,147
Research and development 29,577 28,657 59,380 58,907
Operating expenses 58,038 61,011 118,282 119,054
(Loss)/income from operations (2,465) 38,436 12,090 77,595
Interest income 3,865 2,986 7,691 4,961
Interest expense (254) (270) (505) (536)
Income before income taxes 1,146 41,152 19,276 82,020
Income tax expense 4,672 4,800 15,242 115,212
Share of results of equity-method investee, net of tax 29 39 72 23
Net (loss)/income $ (3,555) $ 36,313 $ 3,962 $ (33,215)
Net (loss)/income per share:        
Basic (in dollars per share) $ (0.05) $ 0.52 $ 0.06 $ (0.47)
Diluted (in dollars per share) $ (0.05) $ 0.51 $ 0.06 $ (0.47)
Weighted average shares outstanding:        
Basic (in shares) 65,930 70,361 66,530 70,467
Diluted (in shares) 65,930 71,425 67,344 70,467