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Debt (Tables) | 9 Months Ended
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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 |

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- Definition Tabular disclosure of the details of the interest expense, discount accretion and effective interest rate related to convertible notes of the entity. + References No definition available. + Details
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- Definition Tabular disclosure of the debt and equity components of convertible debt instruments. + References No definition available. + Details
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