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Investments and Fair Value Measurements - Amortized Cost to Fair Value Reconciliation (Details) - USD ($) $ in Millions	Jul. 01, 2017	Jul. 02, 2016
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	$ 509.8	$ 410.0
Gross Unrealized Gains	0.1	109.5
Gross Unrealized Losses	(0.8)	(0.4)
Available-for-sale Securities	509.1	519.1
Total debt securities
Available-For-Sale Investments
Amortized Cost/ Carrying Cost		347.9
Gross Unrealized Gains		0.3
Gross Unrealized Losses		(0.4)
Available-for-sale Securities		347.8
U.S. treasuries
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	56.8	46.1
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.1)	0.0
Available-for-sale Securities	56.7	46.1
U.S. agencies
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	45.0	24.9
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	(0.1)	0.0
Available-for-sale Securities	44.9	24.9
Municipal bonds and sovereign debt instruments
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	4.4	2.0
Gross Unrealized Gains	0.0	0.0
Gross Unrealized Losses	0.0	0.0
Available-for-sale Securities	4.4	2.0
Asset-backed securities
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	71.5	50.4
Gross Unrealized Gains	0.0	0.1
Gross Unrealized Losses	(0.4)	(0.3)
Available-for-sale Securities	71.1	50.2
Corporate securities
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	326.1	224.5
Gross Unrealized Gains	0.1	0.2
Gross Unrealized Losses	(0.2)	(0.1)
Available-for-sale Securities	326.0	224.6
Certificates of deposit
Available-For-Sale Investments
Amortized Cost/ Carrying Cost	6.0
Gross Unrealized Gains	0.0
Gross Unrealized Losses	0.0
Available-for-sale Securities	$ 6.0
Marketable equity securities
Available-For-Sale Investments
Amortized Cost/ Carrying Cost		62.1
Gross Unrealized Gains		109.2
Gross Unrealized Losses		0.0
Available-for-sale Securities		$ 171.3

X

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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