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Investments and Fair Value Measurements (Details 2) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Jul. 02, 2016	Aug. 01, 2015
Trading securities related to deferred compensation plan
Term of maturities of securities classified as current assets included in short-term investments	12 months
Fair Value	$ 580.9		$ 519.1
Other-than-temporary impairment loss	0.0	$ 0.0
Not designated | Foreign exchange forward contracts
Foreign Currency Forward Contracts
Derivative asset, fair value	1.8
Derivative liability, fair value	1.5
Gain on derivatives	0.3	$ 0.6
Not designated | Foreign exchange forward contracts | Held to purchase
Foreign Currency Forward Contracts
Notional amount of forward contracts	119.9		110.0
Not designated | Foreign exchange forward contracts | Held to sell
Foreign Currency Forward Contracts
Notional amount of forward contracts	$ 56.4		55.2
Lumentum
Trading securities related to deferred compensation plan
Shares held in investment (in shares)	3.4			11.7
Marketable equity investments
Trading securities related to deferred compensation plan
Fair Value	$ 141.1		$ 171.3
Realized gain on sale of marketable equity securities	81.5
Income tax effect related to gain on sale of marketable security	$ 0.0
Marketable equity investments | Lumentum
Trading securities related to deferred compensation plan
Shares held in investment (in shares)	3.4		7.2
Number of shares sold (in shares)	3.9
Cash equivalents
Trading securities related to deferred compensation plan
Fair Value	$ 23.9		$ 36.1
Short-term investments
Trading securities related to deferred compensation plan
Fair Value	415.2		311.1
Short-term investments | Marketable equity investments
Trading securities related to deferred compensation plan
Fair Value	141.1		171.3
Other non-current assets
Trading securities related to deferred compensation plan
Fair Value	0.7		0.6
Trading securities | Short-term investments
Trading securities related to deferred compensation plan
Deferred compensation plan assets	2.5		2.4
Trading securities | Short-term investments | Debt securities
Trading securities related to deferred compensation plan
Deferred compensation plan assets	0.2		0.3
Trading securities | Short-term investments | Money market instruments and funds
Trading securities related to deferred compensation plan
Deferred compensation plan assets	0.8		0.8
Trading securities | Short-term investments | Marketable equity investments
Trading securities related to deferred compensation plan
Deferred compensation plan assets	$ 1.5		$ 1.3

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