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Summary of significant accounting policies (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jul. 02, 2016
Property, Plant and Equipment [Line Items]      
Fiscal year 364 days 364 days 371 days
Fair value assets transfers level 1 to level 2 $ 0.0 $ 0.0 $ 0.0
Fair value assets transfers level 2 to level 1 0.0 0.0 0.0
Fair value assets transfers into and out of level 3, net $ 0.0 0.0 $ 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 $ 6.1 $ 208.3  
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