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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Dec. 30, 2017 | Dec. 31, 2016
Net revenue | $ 213,691 | $ 149,639
Cost of sales | 114,652 | 81,321
Gross profit | 99,039 | 68,318
Selling, general and administrative | 30,218 | 29,532
Research and development | 30,250 | 21,505
Operating expenses | 60,468 | 51,037
Income from operations | 38,571 | 17,281
Interest income | 1,975 | 1,172
Interest expense | (266) | (262)
Income before income taxes | 40,280 | 18,191
Income tax expense | 109,633 | 2,608
Share of results of equity-method investee, net of tax | (16) | 0
Net (loss)/income | $ (69,337) | $ 15,583
Net (loss)/income per share: |  |
Basic (in dollars per share) | $ (0.98) | $ 0.22
Diluted (in dollars per share) | $ (0.98) | $ 0.22
Weighted average shares outstanding: |  |
Basic (in shares) | 70,577 | 70,854
Diluted (in shares) | 70,577 | 71,763

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