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Debt (Tables) | 6 Months Ended
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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 |

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