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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 | Mar. 31, 2019 USD ($) | Jun. 24, 2018 USD ($)
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | $ 49,448 | $ 162,807
Unrealized Loss, Less than 12 Months | (20) | (1,987)
Fair Value, Greater than 12 Months | 105,514 | 5,128
Unrealized Loss, Greater than 12 Months | (570) | (140)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 154,962 | 167,935
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 590 | $ 2,127
Number of Securities with an Unrealized Loss, Less than 12 Months | 54 | 151
Number of Securities with an Unrealized Loss, Greater than 12 Months | 85 | 6
Number of Securities with an Unrealized Loss, Total | 139 | 157
Municipal Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | $ 2,406 | $ 97,470
Unrealized Loss, Less than 12 Months | 0 | (861)
Fair Value, Greater than 12 Months | 68,677 | 3,642
Unrealized Loss, Greater than 12 Months | (297) | (78)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 71,083 | 101,112
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 297 | 939
Corporate Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 31,144 | 61,453
Unrealized Loss, Less than 12 Months | (17) | (1,088)
Fair Value, Greater than 12 Months | 32,930 | 1,486
Unrealized Loss, Greater than 12 Months | (257) | (62)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 64,074 | 62,939
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 274 | 1,150
US Government Agencies Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 5,788 | 3,884
Unrealized Loss, Less than 12 Months | (1) | (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 | 5,788 | 3,884
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 1 | 38
US Treasury Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 10,110 | 0
Unrealized Loss, Less than 12 Months | (2) | 0
Fair Value, Greater than 12 Months | 3,907 | 0
Unrealized Loss, Greater than 12 Months | (16) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 14,017 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 18 | $ 0

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