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Debt (Tables)
 3 Months Ended
Sep. 29, 2018
Debt Disclosure [Abstract]  
Schedule of carrying amounts of the liability and equity components of convertible debt
The following table presents the carrying amounts of the liability and equity components (in millions):
 
September 29, 2018
 
June 30, 2018
Principal amount of 0.625% Senior Convertible Notes
$
142.7

 
$
277.0

Principal amount of 1.00% Senior Convertible Notes
460.0

 
460.0

Principal amount of 1.75% Senior Convertible Notes
225.0

 
225.0

Unamortized discount of liability component
(114.6
)
 
(121.1
)
Unamortized debt issuance cost
(7.3
)
 
(7.7
)
Carrying amount of liability component
$
705.8

 
$
833.2

  Current portion of long-term debt
142.7

 
275.3

Long-term debt, net of current portion
$
563.1

 
$
557.9

 
 
 
 
Carrying amount of equity component (1)
$
239.1

 
$
239.1


(1)
Included in additional paid-in-capital on the Consolidated Balance Sheets.
Summary of effective interest rate and the interest expense for the contractual interest and the accretion of debt discount
The following table presents the interest expense for contractual interest, amortization of debt issuance cost and accretion of debt discount (in millions):
 
Three Months Ended
 
September 29, 2018
 
September 30, 2017
Interest expense-contractual interest
$
2.5

 
$
2.0

Amortization of debt issuance cost
0.4

 
0.7

Accretion of debt discount
6.5

 
9.1