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Restructuring - Charges Incurred (Details) - USD ($)
$ in Millions
 12 Months Ended 24 Months Ended
Jun. 30, 2019
Jun. 24, 2018
Jun. 25, 2017
Jun. 30, 2019
Restructuring Cost and Reserve [Line Items]        
Loss on disposal or impairment of long-lived assets $ 4.7 $ 8.4 $ 1.8  
Severance expense 4.2 3.8 0.0  
Total restructuring charges 8.3 3.8 $ 0.0  
Capacity and overhead cost reductions        
Restructuring Cost and Reserve [Line Items]        
Loss on disposal or impairment of long-lived assets 0.0 0.2   $ 0.2
Severance expense 0.7 3.5   4.2
Lease termination and facility consolidation costs 1.9 0.1   2.0
Total restructuring charges 2.6 $ 3.8   $ 6.4
Factory optimization costs        
Restructuring Cost and Reserve [Line Items]        
Loss on disposal or impairment of long-lived assets 2.3      
Lease termination and facility consolidation costs 1.8      
Total restructuring charges $ 4.1