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Investments, Forward Contracts and Fair Value Measurements - Measured at Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Jul. 01, 2017
--- | --- | ---
Other current liabilities |  |
Liability: |  |
Total liabilities | $ 0.9 | $ 1.3
Recurring basis | Cash and cash equivalents |  |
Debt available-for-sale securities |  |
Total assets | 588.7 | 789.2
Recurring basis | Short-term investments |  |
Debt available-for-sale securities |  |
Total assets | 430.9 | 432.2
Recurring basis | Restricted cash |  |
Debt available-for-sale securities |  |
Total assets | 7.3 | 11.0
Recurring basis | Prepayments and other current assets |  |
Debt available-for-sale securities |  |
Total assets | 4.0 |
Recurring basis | Other current assets |  |
Debt available-for-sale securities |  |
Total assets |  | 7.3
Recurring basis | Other non-current assets |  |
Debt available-for-sale securities |  |
Total assets | 5.0 | 5.1
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 88.4 | 56.7
Money market funds | 530.5 | 726.4
Trading securities | 2.1 | 2.0
Foreign currency forward contracts | 0.0 | 0.0
Total assets | 621.0 | 785.1
Liability: |  |
Foreign currency forward contracts | 0.0 | 0.0
Total liabilities | 0.0 | 0.0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. treasuries |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 88.4 | 56.7
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. agencies |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal bonds and sovereign debt instruments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Certificates of deposit |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Recurring basis | Significant Other Observable Inputs (Level 2) |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 410.9 | 452.4
Money market funds | 0.0 | 0.0
Trading securities | 0.0 | 0.0
Foreign currency forward contracts | 4.0 | 7.3
Total assets | 414.9 | 459.7
Liability: |  |
Foreign currency forward contracts | 0.9 | 1.3
Total liabilities | 0.9 | 1.3
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. treasuries |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 0.0
Recurring basis | Significant Other Observable Inputs (Level 2) | U.S. agencies |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 13.8 | 44.9
Recurring basis | Significant Other Observable Inputs (Level 2) | Municipal bonds and sovereign debt instruments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 4.4 | 4.4
Recurring basis | Significant Other Observable Inputs (Level 2) | Asset-backed securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 62.3 | 71.1
Recurring basis | Significant Other Observable Inputs (Level 2) | Corporate securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 330.4 | 326.0
Recurring basis | Significant Other Observable Inputs (Level 2) | Certificates of deposit |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 0.0 | 6.0
Recurring basis | Total |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 499.3 | 509.1
Money market funds | 530.5 | 726.4
Trading securities | 2.1 | 2.0
Foreign currency forward contracts | 4.0 | 7.3
Total assets | 1,035.9 | 1,244.8
Liability: |  |
Foreign currency forward contracts | 0.9 | 1.3
Total liabilities | 0.9 | 1.3
Recurring basis | Total | U.S. treasuries |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 88.4 | 56.7
Recurring basis | Total | U.S. agencies |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 13.8 | 44.9
Recurring basis | Total | Municipal bonds and sovereign debt instruments |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 4.4 | 4.4
Recurring basis | Total | Asset-backed securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 62.3 | 71.1
Recurring basis | Total | Corporate securities |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | 330.4 | 326.0
Recurring basis | Total | Certificates of deposit |  |
Debt available-for-sale securities |  |
Total debt available-for-sale securities | $ 0.0 | $ 6.0

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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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