Long-term Debt - Interest Expense (Details) - USD ($)	12 Months Ended
	Jun. 30, 2019	Jun. 24, 2018	Jun. 25, 2017
Debt Instrument [Line Items]
Amortization of discount and issuance costs	$ 18,300,000	$ 0	$ 0
Convertible Notes | Convertible Notes due September 1, 2023
Debt Instrument [Line Items]
Interest expense	4,300,000
Amortization of discount and issuance costs	18,300,000
Total interest expense	$ 22,600,000	$ 0	$ 0