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Summary of significant accounting policies - ASC 606 impact to previously reported results (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Sep. 29, 2018 | Sep. 30, 2017 | Oct. 01, 2016 | Oct. 03, 2015
Statement of Financial Position [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net | $ 73,214 |  |  |  | $ 47,363 |  |  |  | $ 73,214 | $ 47,363 | $ 45,307 |
Inventories, net | 193,193 |  |  |  | 113,856 |  |  |  | 193,193 | 113,856 | 53,562 |
Deferred costs of revenue |  |  |  |  |  |  |  |  |  |  | 0 |
Prepaid and other current assets | 10,073 |  |  |  | 9,462 |  |  |  | 10,073 | 9,462 | 9,437 |
Deferred tax assets | 941 |  |  |  | 1,107 |  |  |  | 941 | 1,107 | 2,544 |
Deferred revenue | 11,615 |  |  |  | 10,920 |  |  |  | 11,615 | 10,920 | 36,160 |
Other current liabilities | 10,858 |  |  |  | 8,497 |  |  |  | 10,858 | 8,497 | 6,535 |
Stockholders’ equity (deficit) | 208,358 |  |  |  | 27 |  |  |  | 208,358 | 27 | (28,788) | $ (19,859)
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue | 272,940 | $ 208,398 | $ 186,720 | $ 468,950 | 214,095 | $ 223,078 | $ 182,546 | $ 372,807 | 1,137,008 | 992,526 | 901,284 | 843,524
Cost of revenue |  |  |  |  |  |  |  |  | 647,700 | 536,461 | 497,885 | 461,387
Provision for income taxes |  |  |  |  |  |  |  |  | 1,056 | (2,291) | 2,644 | 3,242
Net loss | $ (1,720) | $ (26,988) | $ (32,592) | $ 45,697 | $ (14,906) | $ (14,539) | $ (19,790) | $ 35,017 | $ (15,604) | $ (14,217) | (38,214) | (68,777)
As previously reported |  |  |  |  |  |  |  |  |  |  |  |
Statement of Financial Position [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  |  |  |  |  |  |  |  | 48,569 |
Inventories, net |  |  |  |  |  |  |  |  |  |  | 53,553 |
Deferred costs of revenue |  |  |  |  |  |  |  |  |  |  | 27,478 |
Prepaid and other current assets |  |  |  |  |  |  |  |  |  |  | 8,850 |
Deferred tax assets |  |  |  |  |  |  |  |  |  |  | 6,207 |
Deferred revenue |  |  |  |  |  |  |  |  |  |  | 96,696 |
Other current liabilities |  |  |  |  |  |  |  |  |  |  | 4,599 |
Stockholders’ equity (deficit) |  |  |  |  |  |  |  |  |  |  | (53,581) |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  |  | 904,049 | 860,652
Cost of revenue |  |  |  |  |  |  |  |  |  |  | 494,673 | 468,229
Provision for income taxes |  |  |  |  |  |  |  |  |  |  | 2,930 | 2,734
Net loss |  |  |  |  |  |  |  |  |  |  | (32,523) | (57,983)
Impact of adoption | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |
Statement of Financial Position [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable, net |  |  |  |  |  |  |  |  |  |  | (3,262) |
Inventories, net |  |  |  |  |  |  |  |  |  |  | 9 |
Deferred costs of revenue |  |  |  |  |  |  |  |  |  |  | (27,478) |
Prepaid and other current assets |  |  |  |  |  |  |  |  |  |  | 587 |
Deferred tax assets |  |  |  |  |  |  |  |  |  |  | (3,663) |
Deferred revenue |  |  |  |  |  |  |  |  |  |  | (60,536) |
Other current liabilities |  |  |  |  |  |  |  |  |  |  | 1,936 |
Stockholders’ equity (deficit) |  |  |  |  |  |  |  |  |  |  | 24,793 |
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  |  |  |  |  |  | (2,765) | (17,128)
Cost of revenue |  |  |  |  |  |  |  |  |  |  | 3,212 | (6,842)
Provision for income taxes |  |  |  |  |  |  |  |  |  |  | (286) | 508
Net loss |  |  |  |  |  |  |  |  |  |  | $ (5,691) | $ (10,794)

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