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Debt - Interest Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 30, 2017
Dec. 31, 2016
Debt Disclosure [Abstract]        
Interest expense-contractual interest $ 1.8 $ 1.0 $ 3.8 $ 2.0
Amortization of debt issuance cost 0.6 0.6 1.3 1.1
Accretion of debt discount $ 8.4 $ 7.0 $ 17.5 $ 13.9