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Debt (Tables)
 6 Months Ended
Dec. 30, 2017
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):
 
December 30, 2017
 
July 1, 2017
Principal amount of 0.625% Senior Convertible Notes
$
451.0

 
$
610.0

Principal amount of 1.00% Senior Convertible Notes
460.0

 
460.0

Unamortized discount of liability component
(104.7
)
 
(129.4
)
Unamortized debt issuance cost
(7.3
)
 
(9.2
)
Carrying amount of liability component
$
799.0

 
$
931.4

  Current portion of long-term debt
436.8

 
—

Long-term debt, net of current portion
$
362.2

 
$
931.4

 
 
 
 
Carrying amount of equity component (1)
$
209.7

 
$
229.7


(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
 
Six Months Ended
 
December 30, 2017
 
December 31, 2016
 
December 30, 2017
 
December 31, 2016
Interest expense-contractual interest
$
1.8

 
$
1.0

 
$
3.8

 
$
2.0

Amortization of debt issuance cost
0.6

 
0.6

 
1.3

 
1.1

Accretion of debt discount
8.4

 
7.0

 
17.5

 
13.9