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Summary of significant accounting policies (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 29, 2018
Jul. 03, 2021
Jun. 27, 2020
Jun. 29, 2019
Property, Plant and Equipment [Line Items]        
Revenue, Remaining Performance Obligation, Optional Exemption, Performance Obligation [true false] true      
Maximum payment terms   1 year    
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    
Lease term   17 years    
Level 1        
Property, Plant and Equipment [Line Items]        
Fair value of Cash equivalents recorded based upon level 1   $ 3,800,000 $ 20,900,000  
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