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Summary of significant accounting policies (Details) - USD ($)
12 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jul. 01, 2017
Property, Plant and Equipment [Line Items]      
Fiscal year 364 days 364 days 364 days
Fair value assets transfers level 1 to level 2 $ 0 $ 0 $ 0
Fair value assets transfers level 2 to level 1 0 0 0
Fair value assets transfers into and out of level 3, net $ 0 0 $ 0
Minimum      
Property, Plant and Equipment [Line Items]      
Intangible asset, useful life 5 years    
Maximum      
Property, Plant and Equipment [Line Items]      
Intangible asset, useful life 10 years    
Level 1      
Property, Plant and Equipment [Line Items]      
Fair value of Cash equivalents recorded based upon level 1 $ 9,400,000 $ 6,100,000  
Building      
Property, Plant and Equipment [Line Items]      
Useful life 30 years    
Machinery Fixtures And Equipment      
Property, Plant and Equipment [Line Items]      
Useful life 10 years    
Machinery Fixtures And Equipment | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life 2 years    
Information Technology Hardware and Software      
Property, Plant and Equipment [Line Items]      
Useful life 10 years    
Information Technology Hardware and Software | Minimum      
Property, Plant and Equipment [Line Items]      
Useful life 2 years