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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
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)

X

- 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

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X

- 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

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- References

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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

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