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Investments (Summary of Short-term Investments by Type) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Mar. 26, 2017 | Jun. 26, 2016
Schedule of Available-for-sale Securities [Line Items] |  |
Document Period End Date | Mar. 26, 2017 |
Available-for-sale Securities, Debt Securities, Current | $ 474,783 | $ 439,151
Amortized Cost | 472,958 | 432,603
Gross Unrealized Gains | 2,520 | 6,636
Gross Unrealized Losses | (695) | (88)
Estimated Fair Value | 474,783 | 439,151
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | 183,548 |
Amortized Cost | 182,500 | 186,893
Gross Unrealized Gains | 1,266 | 3,562
Gross Unrealized Losses | (218) | (15)
Estimated Fair Value | 183,548 | 190,440
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | 169,569 |
Amortized Cost | 168,792 | 165,766
Gross Unrealized Gains | 1,254 | 3,074
Gross Unrealized Losses | (477) | (73)
Estimated Fair Value | 169,569 | 168,767
Commercial Paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | 678 |
Amortized Cost | 678 | 3,317
Estimated Fair Value | 678 | 3,317
U.S. | Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | 11,087 |
Amortized Cost | 11,087 | 3,500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 11,087 | 3,500
Non-US [Member] | Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available-for-sale Securities, Debt Securities, Current | 109,901 |
Amortized Cost | 109,901 | 73,127
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 109,901 | $ 73,127

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