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Debt (Tables) | 12 Months Ended
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Jun. 30, 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):
| June 30, 2018 |  | July 1, 2017
Principal amount of 0.625% Senior Convertible Notes | $ | 277.0 |  |  | $ | 610.0 |
Principal amount of 1.00% Senior Convertible Notes | 460.0 |  |  | 460.0 |
Principal amount of 1.75% Senior Convertible Notes | 225.0 |  |  | — |
Unamortized discount of liability component | (121.1 | ) |  | (129.4 | )
Unamortized debt issuance cost | (7.7 | ) |  | (9.2 | )
Carrying amount of liability component | 833.2 |  |  | 931.4 |
Current portion of long-term debt | 275.3 |  |  | — |
Long-term debt, net of current portion | 557.9 |  |  | 931.4 |
Carrying amount of equity component (1) | $ | 239.1 |  |  | $ | 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):
| Years ended |  |
| June 30, 2018 |  | July 1, 2017 |  | July 2, 2016
Interest expense-contractual interest | $ | 7.7 |  |  | $ | 5.5 |  |  | $ | 4.1 |
Amortization of debt issuance cost | 2.6 |  |  | 2.5 |  |  | 2.1 |
Accretion of debt discount | 33.8 |  |  | 32.1 |  |  | 26.7 |

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