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Investments and Fair Value Measurements - Additional Information (Details) - USD ($) shares in Millions, $ in Millions	6 Months Ended	12 Months Ended
	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016	Jun. 27, 2015	Aug. 01, 2015
Investments
Available-for-sale Securities	$ 519.1	$ 509.1	$ 519.1
Other-than-temporary impairment loss		0.0	0.0	$ 0.0
Not designated | Foreign exchange forward contracts
Investments
Derivative asset, fair value		7.3
Derivative liability, fair value		1.3
Gains (losses) on derivatives		3.3	(9.6)
Not designated | Foreign exchange forward contracts | Held to purchase
Investments
Notional amount of forward contracts	110.0	134.3	110.0
Not designated | Foreign exchange forward contracts | Held to sell
Investments
Notional amount of forward contracts	55.2	25.4	55.2
Cash equivalents
Investments
Available-for-sale Securities	36.1	78.2	36.1
Short-term investments
Investments
Available-for-sale Securities	311.1	430.2	311.1
Other non-current assets
Investments
Available-for-sale Securities	0.6	0.7	0.6
Trading securities | Short-term investments
Investments
Deferred compensation plan assets	2.4	2.0	2.4
Trading securities | Short-term investments | Total debt securities
Investments
Deferred compensation plan assets	0.3	0.5	0.3
Trading securities | Short-term investments | Money market instruments and funds
Investments
Deferred compensation plan assets	0.8	0.3	0.8
Trading securities | Short-term investments | Marketable equity securities
Investments
Deferred compensation plan assets	1.3	1.2	1.3
Lumentum
Investments
Shares held in investment (in shares)					11.7
Marketable equity securities
Investments
Available-for-sale Securities	$ 171.3		171.3
Number of equity securities sold (in shares)	4.5
Gross realized gain (loss)	$ 71.5	203.0	71.5
Income tax effect on gross realized gain (loss)	2.0	$ 0.0
Marketable equity securities | Short-term investments
Investments
Available-for-sale Securities	$ 171.3		$ 171.3
Marketable equity securities | Lumentum
Investments
Shares held in investment (in shares)	7.2		7.2
Number of equity securities sold (in shares)		7.2

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