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Debt - Interest Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 28, 2019
Dec. 29, 2018
Debt Disclosure [Abstract]        
Interest expense-contractual interest $ 2.2 $ 2.1 $ 4.3 $ 4.5
Amortization of debt issuance cost 0.4 0.3 0.7 0.7
Accretion of debt discount $ 5.2 $ 4.9 $ 10.3 $ 11.4