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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Oct. 03, 2015
Sep. 27, 2014
Sep. 28, 2013
Income Statement [Abstract]      
Net revenue $ 536,471 $ 568,569 $ 534,938
Cost of sales 277,379 295,015 287,993
Gross profit 259,092 273,554 246,945
Selling, general and administrative 131,808 113,514 119,519
Research and development 90,033 83,056 61,620
Operating expenses 221,841 196,570 181,139
Income from operations 37,251 76,984 65,806
Interest income 1,637 1,197 883
Interest expense (1,183) (1,048) (21)
Income from operations before income taxes 37,705 77,133 66,668
Income tax (benefit)/ expense (12,934) 14,145 7,310
Net income $ 50,639 $ 62,988 $ 59,358
Net income per share:      
Basic (in dollars per share) $ 0.67 [1] $ 0.82 [1] $ 0.79
Diluted (in dollars per share) $ 0.67 [1] $ 0.81 [1] $ 0.78
Weighted average shares outstanding:      
Basic (in shares) 75,414 76,396 75,132
Diluted (in shares) 75,659 77,292 76,190
[1] EPS for the year may not equal the sum of quarterly EPS due to changes in weighted share calculations.