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Debt (Tables) | 6 Months Ended
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Dec. 28, 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):
| December 28, 2019 |  | June 29, 2019
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 | (89.5 | ) |  | (99.8 | )
Unamortized debt issuance cost | (5.7 | ) |  | (6.4 | )
Carrying amount of liability component | $ | 589.8 |  |  | $ | 578.8 |
Carrying amount of equity component (1) | $ | 136.8 |  |  | $ | 136.8 |
(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 costs and accretion of debt discount (in millions):
| Three Months Ended |  | Six Months Ended
| December 28, 2019 |  | December 29, 2018 |  | December 28, 2019 |  | December 29, 2018
Interest expense-contractual interest | $ | 2.2 |  |  | $ | 2.1 |  |  | $ | 4.3 |  |  | $ | 4.5 |
Amortization of debt issuance cost | 0.4 |  |  | 0.3 |  |  | 0.7 |  |  | 0.7 |
Accretion of debt discount | 5.2 |  |  | 4.9 |  |  | 10.3 |  |  | 11.4 |

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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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