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Convertible Senior Notes (Tables)
 3 Months Ended
Sep. 29, 2018
Debt Disclosure [Abstract]  
Components of 2024 Notes
The 2024 Notes consisted of the following components as of the periods presented (in millions):
Liability component:
September 29, 2018
 
June 30, 2018
Principal
$
450.0

 
$
450.0

Unamortized debt discount
(111.5
)
 
(115.8
)
Net carrying amount of the liability component
$
338.5

 
$
334.2
Interest Expense on Convertible Debt
The following table sets forth interest expense information related to the 2024 Notes for the periods presented (in millions, except percentages):
 
Three Months Ended
(in millions, except percentages)
September 29, 2018
 
September 30, 2017
Contractual interest expense
$
0.3

 
$
0.3

Amortization of the debt discount
4.3

 
4.1

Total interest expense
$
4.6

 
$
4.4

Effective interest rate on the liability component
5.4
%
 
5.4
%