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Long-term Debt - Interest Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 29, 2019 | Dec. 30, 2018 | Dec. 29, 2019 | Dec. 30, 2018
Debt Instrument [Line Items] |  |  |  |
Amortization of discount and issuance costs |  |  | $ 11.4 | $ 7.2
Convertible Notes | Convertible Notes due September 1, 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense | $ 1.2 | $ 1.3 | 2.5 | 1.7
Amortization of discount and issuance costs | 5.8 | 5.4 | 11.4 | 7.2
Total interest expense | $ 7.0 | $ 6.7 | $ 13.9 | $ 8.9

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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 + Details
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