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Investments, Forward Contracts and Fair Value Measurements - Additional Information (Details) - USD ($) shares in Millions	12 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jul. 02, 2016
Investments
Total debt available-for-sale securities	$ 189,600,000	$ 509,100,000
Other-than-temporary impairment charges	0	0	$ 0
Not designated | Foreign exchange forward contracts
Investments
Derivative asset, fair value	2,700,000
Derivative liability, fair value	11,700,000
(Loss) gain on derivatives	$ (800,000)	3,300,000
Not designated | Foreign exchange forward contracts | Held to purchase
Investments
Derivative term	120 days
Notional amount of forward contracts	$ 167,500,000	134,300,000
Not designated | Foreign exchange forward contracts | Held to sell
Investments
Notional amount of forward contracts	28,600,000	25,400,000
Short-term investments
Investments
Deferred compensation plan assets	1,600,000	$ 2,000,000
Short-term investments | Debt securities
Investments
Deferred compensation plan assets	400,000
Short-term investments | Money market funds
Investments
Deferred compensation plan assets	300,000
Short-term investments | Marketable equity securities
Investments
Deferred compensation plan assets	900,000
Lumentum
Investments
Number of equity securities sold (in shares)		7.2
Gross gain on sale of investments		$ 203,000,000
Tax effect on sale		0
Cash equivalents
Investments
Total debt available-for-sale securities	21,200,000	78,200,000
Short-term investments
Investments
Total debt available-for-sale securities	167,700,000	430,200,000
Other non-current assets
Investments
Total debt available-for-sale securities	$ 700,000	700,000
Money market funds | Short-term investments
Investments
Deferred compensation plan assets		300,000
Marketable equity securities | Short-term investments
Investments
Deferred compensation plan assets		1,200,000
Debt securities | Short-term investments
Investments
Deferred compensation plan assets		$ 500,000

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