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Investments and Fair Value Measurements - Gross Unrealized Losses on Available-For-Sale Securities (Details) - USD ($) $ in Millions | Jul. 01, 2017 | Jul. 02, 2016
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Gross unrealized losses on available-for-sale securities |  |
Less than 12 Months | $ (0.5) | $ (0.1)
Greater than 12 Months | (0.3) | (0.3)
Total | (0.8) | (0.4)
U.S. treasuries and agencies |  |
Gross unrealized losses on available-for-sale securities |  |
Less than 12 Months | (0.2) |
Greater than 12 Months | 0.0 |
Total | (0.2) |
Asset-backed securities |  |
Gross unrealized losses on available-for-sale securities |  |
Less than 12 Months | (0.1) | 0.0
Greater than 12 Months | (0.3) | (0.3)
Total | (0.4) | (0.3)
Corporate securities |  |
Gross unrealized losses on available-for-sale securities |  |
Less than 12 Months | (0.2) | (0.1)
Greater than 12 Months | 0.0 | 0.0
Total | $ (0.2) | $ (0.1)

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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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