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Quarterly financial data (unaudited) (Tables) | 12 Months Ended
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Sep. 29, 2018
Quarterly Financial Information Disclosure [Abstract] |
Schedule of unaudited quarterly financial information | The following table shows a summary of the Company’s unaudited quarterly financial information for each of the four quarters of 2018 and 2017 (the sum of quarterly periods may not equal full-year amounts due to rounding):
| Three Months Ended
| September 29, 2018 |  | June 30, 2018 |  | March 31, 2018 |  | December 30, 2017
(In thousands, except per share amounts) |  |  |  |  |  |  |
Revenue | $ | 272,940 |  |  | $ | 208,398 |  |  | $ | 186,720 |  |  | $ | 468,950 |
Gross profit | 116,277 |  |  | 95,489 |  |  | 81,341 |  |  | 196,201 |
Net income (loss) | (1,720 | ) |  | (26,988 | ) |  | (32,592 | ) |  | 45,697 |
Net income (loss) per share - basic | $ | (0.02 | ) |  | $ | (0.45 | ) |  | $ | (0.55 | ) |  | $ | 0.42 |
Net income (loss) per share - diluted | $ | (0.02 | ) |  | $ | (0.45 | ) |  | $ | (0.55 | ) |  | $ | 0.36 |
| Three Months Ended
| September 30, 2017 |  | July 1, 2017 |  | April 1, 2017 |  | December 31, 2016
(In thousands, except per share amounts) |  |  |  |  |  |  |
Revenue | $ | 214,095 |  |  | $ | 223,078 |  |  | $ | 182,546 |  |  | $ | 372,807 |
Gross profit | 102,891 |  |  | 107,288 |  |  | 86,105 |  |  | 159,782 |
Net income (loss) | (14,906 | ) |  | (14,539 | ) |  | (19,790 | ) |  | 35,017 |
Net income (loss) per share - basic | $ | (0.26 | ) |  | $ | (0.26 | ) |  | $ | (0.35 | ) |  | $ | 0.32 |
Net income (loss) per share - diluted | $ | (0.26 | ) |  | $ | (0.26 | ) |  | $ | (0.35 | ) |  | $ | 0.26 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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