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Discontinued Operations (Tables) | 12 Months Ended
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Sep. 27, 2019
Discontinued Operations and Disposal Groups [Abstract] |
Summary of Operating Results Related to Divested Businesses | The accompanying Consolidated Statements of Operations includes the following operating results related to these discontinued operations (in thousands):
| Fiscal Years
| 2018 |  | 2017
Revenue (1) | $ | — |  |  | $ | 660 |
Cost of revenue (1) | (596 | ) |  | 2,252 |
Gross profit (loss) | 596 |  |  | (1,592 | )
Operating expenses: |  |  |
Research and development (1) | 5,251 |  |  | 29,167 |
Selling, general and administrative (1) | 1,560 |  |  | 13,840 |
Total operating expenses | 6,811 |  |  | 43,007 |
Loss from discontinued operations (1) | (6,215 | ) |  | (44,599 | )
Other income (2) | — |  |  | 7,500 |
Gain on sale (2) | — |  |  | 18,022 |
Loss income before income taxes | (6,215 | ) |  | (19,077 | )
Income tax provision (benefit) | — |  |  | — |
Loss income from discontinued operations | (6,215 | ) |  | (19,077 | )
Cash flow used in Operating Activities (1) | (10,734 | ) |  | (42,776 | )
Cash flow from Investing Activities (2) | — |  |  | 25,522 |

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