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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Jun. 27, 2015
Jun. 28, 2014
Income Statement [Abstract]        
Net revenue $ 164,634 $ 180,517 $ 417,299 $ 373,836
Cost of sales 87,063 95,360 216,424 192,642
Gross profit 77,571 85,157 200,875 181,194
Selling, general and administrative 36,105 30,093 97,139 81,430
Research and development 25,380 23,480 68,133 60,277
Operating expenses 61,485 53,573 165,272 141,707
Income from operations 16,086 31,584 35,603 39,487
Interest income 469 256 1,184 878
Interest expense (291) (316) (910) (732)
Income from operations before income taxes 16,264 31,524 35,877 39,633
Income tax (benefit)/expense (8,775) 4,908 (4,935) 5,904
Net income $ 25,039 $ 26,616 $ 40,812 $ 33,729
Net income per share:        
Basic (in dollars per share) $ 0.33 $ 0.35 $ 0.53 $ 0.44
Diluted (in dollars per share) $ 0.33 $ 0.34 $ 0.53 $ 0.44
Weighted average shares outstanding:        
Basic (in shares) 75,420 76,596 76,376 76,308
Diluted (in shares) 75,891 77,605 76,778 77,086