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Investments, Forward Contracts and Fair Value Measurements - Additional Information (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Apr. 01, 2017	Apr. 02, 2016	Apr. 01, 2017	Apr. 02, 2016	Jul. 02, 2016	Aug. 01, 2015
Investments, Forward Contracts and Fair Value Measurements
Term of maturities of securities classified as current assets included in short-term investments			12 months
Fair Value	$ 527.1		$ 527.1		$ 519.1
Other-than-temporary impairment loss	0.0	$ 0.0	0.0	$ 0.0
Not designated \| Foreign exchange forward contracts
Foreign Currency Forward Contracts
Derivative asset, fair value	5.2		5.2
Derivative liability, fair value	2.6		2.6
Gains (losses) on derivatives	2.6	$ (5.6)	(2.7)	$ (4.9)
Not designated \| Foreign exchange forward contracts \| Held to purchase
Foreign Currency Forward Contracts
Notional amount of forward contracts	133.6		133.6		110.0
Not designated \| Foreign exchange forward contracts \| Held to sell
Foreign Currency Forward Contracts
Notional amount of forward contracts	$ 31.8		$ 31.8		55.2
Lumentum
Investments, Forward Contracts and Fair Value Measurements
Shares held in investment (in shares)	0.4		0.4			11.7
Marketable equity investments
Investments, Forward Contracts and Fair Value Measurements
Fair Value	$ 20.8		$ 20.8		$ 171.3
Realized gain on sale of marketable equity securities	51.2		$ 186.5
Income tax effect related to gain on sale of marketable security	$ 0.0
Marketable equity investments \| Lumentum
Investments, Forward Contracts and Fair Value Measurements
Shares held in investment (in shares)	0.4		0.4		7.2
Number of shares sold (in shares)	1.3		6.9
Cash equivalents
Investments, Forward Contracts and Fair Value Measurements
Fair Value	$ 49.9		$ 49.9		$ 36.1
Short-term investments
Investments, Forward Contracts and Fair Value Measurements
Fair Value	455.8		455.8		311.1
Short-term investments \| Marketable equity investments
Investments, Forward Contracts and Fair Value Measurements
Fair Value	20.8		20.8		171.3
Other non-current assets
Investments, Forward Contracts and Fair Value Measurements
Fair Value	0.6		0.6		0.6
Trading securities \| Short-term investments
Investments, Forward Contracts and Fair Value Measurements
Deferred compensation plan assets	2.0		2.0		2.4
Trading securities \| Short-term investments \| Debt securities
Investments, Forward Contracts and Fair Value Measurements
Deferred compensation plan assets	0.5		0.5		0.3
Trading securities \| Short-term investments \| Money market instruments and funds
Investments, Forward Contracts and Fair Value Measurements
Deferred compensation plan assets	0.5		0.5		0.8
Trading securities \| Short-term investments \| Marketable equity investments
Investments, Forward Contracts and Fair Value Measurements
Deferred compensation plan assets	$ 1.0		$ 1.0		$ 1.3