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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. 23, 2018 USD ($) | Jun. 24, 2018 USD ($)
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | $ 241,101 | $ 162,807
Unrealized Loss, Less than 12 Months | (1,712) | (1,987)
Fair Value, Greater than 12 Months | 27,887 | 5,128
Unrealized Loss, Greater than 12 Months | (739) | (140)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 268,988 | 167,935
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (2,451) | $ (2,127)
Number of Securities with an Unrealized Loss, Less than 12 Months | 231 | 151
Number of Securities with an Unrealized Loss, Greater than 12 Months | 27 | 6
Number of Securities with an Unrealized Loss, Total | 258 | 157
Municipal Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | $ 84,371 | $ 97,470
Unrealized Loss, Less than 12 Months | (838) | (861)
Fair Value, Greater than 12 Months | 15,303 | 3,642
Unrealized Loss, Greater than 12 Months | (384) | (78)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 99,674 | 101,112
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (1,222) | (939)
Corporate Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 106,340 | 61,453
Unrealized Loss, Less than 12 Months | (804) | (1,088)
Fair Value, Greater than 12 Months | 12,584 | 1,486
Unrealized Loss, Greater than 12 Months | (355) | (62)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 118,924 | 62,939
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (1,159) | (1,150)
US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 6,156 | 3,884
Unrealized Loss, Less than 12 Months | (10) | (38)
Fair Value, Greater than 12 Months | 0 | 0
Unrealized Loss, Greater than 12 Months | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 6,156 | 3,884
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (10) | $ (38)
US Treasury Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 44,234 |
Unrealized Loss, Less than 12 Months | (60) |
Fair Value, Greater than 12 Months | 0 |
Unrealized Loss, Greater than 12 Months | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 44,234 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (60) |

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