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Organization and Summary of Significant Accounting Policies - Investments in Available-for-Sale Securities and Cash Equivalents (Detail) - USD ($) $ in Millions	Jun. 27, 2015	Jun. 28, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 384.2	$ 450.9
Gross Unrealized Gains	7.9	8.7
Gross Unrealized Losses		0.1
Fair Value	392.1	459.5
Money Market [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	376.3	439.7
Fair Value	376.3	439.7
Auction Rate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7.9	11.2
Fair Value	15.8	19.8
Current Assets [Member] | Auction Rate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0.6
Fair Value	0.6
Non-Current Assets [Member] | Auction Rate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7.3	11.2
Gross Unrealized Gains	7.9	8.7
Gross Unrealized Losses		0.1
Fair Value	$ 15.2	$ 19.8

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

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