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Debt - Interest Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jul. 02, 2016
Debt Disclosure [Abstract]      
Interest expense-contractual interest $ 7.7 $ 5.5 $ 4.1
Amortization of debt issuance cost 2.6 2.5 2.1
Accretion of debt discount $ 33.8 $ 32.1 $ 26.7