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Debt - Carrying Amounts of the Liability and Equity Components (Details) - USD ($) $ in Millions | Jun. 30, 2018 | May 29, 2018 | Jul. 01, 2017 | Mar. 22, 2017 | Mar. 03, 2017 | Aug. 21, 2013
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Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, net of current portion | $ 557.9 |  | $ 931.4 |  |  |
Convertible Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unamortized discount of liability component | (121.1) |  | (129.4) |  |  |
Unamortized debt issuance cost | (7.7) |  | (9.2) |  |  |
Carrying amount of liability component | 833.2 |  | 931.4 |  |  |
Current portion of long-term debt | 275.3 |  | 0.0 |  |  |
Long-term debt, net of current portion | 557.9 |  | 931.4 |  |  |
Carrying amount of equity component | $ 239.1 |  | 229.7 |  |  |
Convertible Debt | 0.625% Senior Convertible Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on senior convertible notes | 0.625% |  |  |  |  | 0.625%
Principal amount of notes | $ 277.0 |  | 610.0 |  |  |
Unamortized debt issuance cost | $ (0.1) |  |  |  |  |
Carrying amount of liability component |  |  |  |  |  | $ 515.6
Carrying amount of equity component |  |  |  |  |  | $ 134.4
Convertible Debt | 1.00% Senior Convertible Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on senior convertible notes | 1.00% |  |  | 1.00% | 1.00% |
Principal amount of notes | $ 460.0 |  | 460.0 |  |  |
Unamortized debt issuance cost | $ (5.8) |  |  |  |  |
Carrying amount of liability component |  |  |  | $ 358.1 |  |
Carrying amount of equity component |  |  |  | $ 101.9 |  |
Convertible Debt | 1.75% Senior Convertible Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on senior convertible notes | 1.75% | 1.75% |  |  |  |
Principal amount of notes | $ 225.0 |  | $ 0.0 |  |  |
Unamortized debt issuance cost | $ (1.8) |  |  |  |  |
Carrying amount of liability component |  | $ 190.1 |  |  |  |
Carrying amount of equity component |  | $ 34.9 |  |  |  |

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- Definition The portion of the carrying value of long-term convertible debt as of the balance sheet date that is scheduled to be repaid within one year or in the normal operating cycle if longer. Convertible debt is a financial instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount, after accumulated amortization, of debt discount. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition Including the current and noncurrent portions, carrying amount of the debt liability component identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company. + References No definition available. + Details
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