Debt (Tables)

9 Months Ended

Mar. 30, 2019

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 of our debt (in millions):

	March 30, 2019			June 30, 2018
Principal amount of 0.625% Senior Convertible Notes	$	—		$	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	(104.8		)	(121.1		)
Unamortized debt issuance cost	(6.7		)	(7.7		)
Carrying amount of liability component	$	573.5		$	833.2
Current portion of long-term debt	$	—		$	275.3
Long-term debt, net of current portion	$	573.5		$	557.9
Carrying amount of equity component (1)	$	136.7		$	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				Nine Months Ended
	March 30, 2019		March 31, 2018		March 30, 2019		March 31, 2018
Interest expense-contractual interest	$	2.1	$	1.8	$	6.6	$	5.7
Amortization of debt issuance cost	0.3		0.6		1.1		1.9
Accretion of debt discount	4.8		8.2		16.3		25.6