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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
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)

X

- 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

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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

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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

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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.

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