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Debt (Tables)
 6 Months Ended
Jan. 02, 2021
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):
January 2, 2021June 27, 2020
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(68.2)(79.1)
Unamortized debt issuance cost(4.4)(5.0)
Carrying amount of liability component$612.4 $600.9 
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 EndedSix Months Ended
January 2, 2021December 28, 2019January 2, 2021December 28, 2019
Interest expense-contractual interest$2.4 $2.2 $4.7 $4.3 
Amortization of debt issuance cost0.5 0.4 1.0 0.7 
Accretion of debt discount5.5 5.2 10.8 10.3