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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Oct. 03, 2020
Sep. 28, 2019
Sep. 29, 2018
Income Statement [Abstract]      
Net revenue $ 623,176 $ 540,052 $ 889,121
Cost of sales 325,201 285,462 479,680
Gross profit 297,975 254,590 409,441
Selling, general and administrative 116,007 116,811 123,188
Research and development 123,459 116,169 119,621
Operating expenses 239,466 232,980 242,809
Income from operations 58,509 21,610 166,632
Interest income 7,541 15,132 11,971
Interest expense (1,716) (2,055) (1,054)
Income before income taxes 64,334 34,687 177,549
Provision for income taxes 11,998 22,910 120,744
Share of results of equity-method investee, net of tax 36 124 129
Net income $ 52,300 $ 11,653 $ 56,676
Net income per share:      
Basic (in dollars per share) $ 0.83 [1] $ 0.18 [1] $ 0.82
Diluted (in dollars per share) $ 0.83 [1] $ 0.18 [1] $ 0.80
Weighted average shares outstanding:      
Basic (in shares) 62,828 65,286 69,380
Diluted (in shares) 63,359 65,948 70,419
[1] EPS for the year may not equal the sum of quarterly EPS due to changes in weighted share calculations.