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Income taxes - Textual (Details)
$ in Thousands
12 Months Ended
Sep. 29, 2018
USD ($)
Sep. 30, 2017
USD ($)
Oct. 01, 2016
USD ($)
Oct. 03, 2015
USD ($)
Operating Loss Carryforwards [Line Items]        
Provision for (benefit from) income taxes $ 1,056 $ (2,291) $ 2,644 $ 3,242
Undistributed earnings 5,700      
Undistributed earnings, withholding tax liability 300      
Dutch Tax Administration        
Operating Loss Carryforwards [Line Items]        
Operating loss carryforward, profit percent     0.03  
Operating loss carryforward, profit percent, taxable income     0.01  
Provision for (benefit from) income taxes   $ (4,900)    
Federal        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforwards 74,700      
Federal | Generated through tax year 2012        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforwards 46,800      
Federal | Research tax credit carryforward        
Operating Loss Carryforwards [Line Items]        
Tax credit carryforward 25,400      
State        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforwards 45,900      
State | Research tax credit carryforward        
Operating Loss Carryforwards [Line Items]        
Tax credit carryforward 19,100      
Foreign        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforwards 21,900      
Foreign | Tax year expiration, indefinite        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforwards 2,700      
Foreign | Tax year expiration, 2027        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforwards 19,200      
Accounting Standards Update 2016-09 | Federal        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforwards 113,800   $ 39,800  
Accounting Standards Update 2016-09 | State        
Operating Loss Carryforwards [Line Items]        
Net operating loss carryforwards $ 59,800   $ 3,200