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Investments, Forward Contracts and Fair Value Measurements - Gross Unrealized Losses on Available-For-Sale Securities (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Jul. 01, 2017
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Available-For-Sale Investments |  |
Less than 12 Months | $ (0.6) | $ (0.5)
Greater than 12 Months | (0.6) | (0.3)
Total | (1.2) | (0.8)
U.S. treasuries and agencies |  |
Available-For-Sale Investments |  |
Less than 12 Months | (0.1) | (0.2)
Greater than 12 Months | (0.1) | 0.0
Total | (0.2) | (0.2)
Asset-backed securities |  |
Available-For-Sale Investments |  |
Less than 12 Months | (0.1) | (0.1)
Greater than 12 Months | (0.3) | (0.3)
Total | (0.4) | (0.4)
Corporate securities |  |
Available-For-Sale Investments |  |
Less than 12 Months | (0.4) | (0.2)
Greater than 12 Months | (0.2) | 0.0
Total | $ (0.6) | $ (0.2)

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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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