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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Apr. 02, 2016
Mar. 28, 2015
Apr. 02, 2016
Mar. 28, 2015
Income Statement [Abstract]        
Net revenue $ 156,400 $ 145,227 $ 264,934 $ 252,665
Cost of sales 86,753 76,657 144,866 129,361
Gross profit 69,647 68,570 120,068 123,304
Selling, general and administrative 35,499 35,607 63,431 61,034
Research and development 22,439 23,172 46,633 42,753
Operating expenses 57,938 58,779 110,064 103,787
Income from operations 11,709 9,791 10,004 19,517
Interest income 701 453 1,323 715
Interest expense (276) (316) (549) (619)
Income from operations before income taxes 12,134 9,928 10,778 19,613
Income tax expense 7,045 1,997 5,780 3,840
Net income $ 5,089 $ 7,931 $ 4,998 $ 15,773
Net income per share:        
Basic (in dollars per share) $ 0.07 $ 0.10 $ 0.07 $ 0.21
Diluted (in dollars per share) $ 0.07 $ 0.10 $ 0.07 $ 0.20
Weighted average shares outstanding:        
Basic (in shares) 70,389 76,821 70,563 76,855
Diluted (in shares) 70,634 77,570 70,801 77,488