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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)