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Acquisition and Divestiture - Narrative (Details)
$ in Millions
12 Months Ended
Jun. 29, 2017
USD ($)
transaction
Feb. 28, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Business Acquisition [Line Items]          
Goodwill     $ 263.4 $ 244.8 $ 257.4
Proceeds from sale of business     12.0 $ 0.0 $ 0.0
Discontinued Operations, Disposed of by Sale | Specialty Steel Supply          
Business Acquisition [Line Items]          
Number of separate transactions to complete the divestiture | transaction 2        
Proceeds from sale of business $ 12.0        
Pre tax loss from divestiture $ 3.2        
Puris LLC          
Business Acquisition [Line Items]          
Asset purchase price   $ 35.3      
Business combination, working capital     1.7    
Business combination, property, plant, and equipment     6.5    
Identifiable intangible assets     8.5    
Goodwill     $ 18.6