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Investments (Summary of Gross Unrealized Losses and Estimated Fair Value of Short-term Investments, Aggregated by Investment Type and Length of Time) (Details) $ in Thousands | Sep. 25, 2016 USD ($) | Jun. 26, 2016 USD ($)
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | $ 29,635 | $ 30,514
Unrealized Loss, Less than 12 Months | (71) | (82)
Fair Value, Greater than 12 Months | 4,107 | 3,535
Unrealized Loss, Greater than 12 Months | (22) | (6)
Fair Value, Total | 33,742 | 34,049
Unrealized Loss, Total | $ (93) | $ (88)
Number of Securities with an Unrealized Loss, Less than 12 Months | 30 | 22
Number of Securities with an Unrealized Loss, Greater than 12 Months | 3 | 3
Number of Securities with an Unrealized Loss, Total | 33 | 25
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | $ 17,003 | $ 2,936
Unrealized Loss, Less than 12 Months | (41) | (9)
Fair Value, Greater than 12 Months | 1,620 | 3,535
Unrealized Loss, Greater than 12 Months | (9) | (6)
Fair Value, Total | 18,623 | 6,471
Unrealized Loss, Total | (50) | (15)
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | 12,632 | 27,578
Unrealized Loss, Less than 12 Months | (30) | (73)
Fair Value, Greater than 12 Months | 2,487 | 0
Unrealized Loss, Greater than 12 Months | (13) | 0
Fair Value, Total | 15,119 | 27,578
Unrealized Loss, Total | $ (43) | $ (73)

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