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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 02, 2018
Feb. 28, 2017
Mar. 30, 2019
Dec. 29, 2018
Mar. 31, 2018
Mar. 30, 2019
Mar. 31, 2018
Business Acquisition [Line Items]              
Embedded derivative liability fair value $ 43.6            
Conversion of preferred stock to common stock       $ 79.4      
Impairment charge     $ 30.7   $ 0.0 $ 30.7 $ 0.0
Private Company Acquisition              
Business Acquisition [Line Items]              
Total consideration   $ 8.7          
Estimated likelihood of achieving production targets   90.00%          
Contingent consideration, cash payment that could result if production targets achieved   $ 3.0          
Period following acquisition date   12 months          
Additional paid-in capital              
Business Acquisition [Line Items]              
Conversion of preferred stock to common stock $ 79.4     $ 79.4   79.4  
Convertible Debt | Level 2              
Business Acquisition [Line Items]              
Convertible senior notes fair value     $ 529.8     $ 529.8