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Long-term Debt - Interest Expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 27, 2020
Dec. 29, 2019
Dec. 27, 2020
Dec. 29, 2019
Debt Instrument [Line Items]        
Amortization of debt issuance costs and discount, net of capitalized interest     $ 18.1 $ 11.4
Convertible Notes        
Debt Instrument [Line Items]        
Interest expense, net of capitalized interest $ 2.8 $ 1.2 6.0 2.5
Amortization of debt issuance costs and discount, net of capitalized interest 8.7 5.8 18.1 11.4
Total interest expense, net $ 11.5 $ 7.0 $ 24.1 $ 13.9