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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 | Dec. 24, 2017 USD ($) | Jun. 25, 2017 USD ($)
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | $ 219,155 | $ 84,220
Unrealized Loss, Less than 12 Months | (1,467) | (263)
Fair Value, Greater than 12 Months | 20,629 | 0
Unrealized Loss, Greater than 12 Months | (327) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 239,784 | 84,220
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 1,794 | $ 263
Number of Securities with an Unrealized Loss, Less than 12 Months | 148 | 67
Number of Securities with an Unrealized Loss, Greater than 12 Months | 23 | 0
Number of Securities with an Unrealized Loss, Total | 171 | 67
Municipal Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | $ 115,005 | $ 26,816
Unrealized Loss, Less than 12 Months | (897) | (68)
Fair Value, Greater than 12 Months | 7,821 | 0
Unrealized Loss, Greater than 12 Months | (90) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 122,826 | 26,816
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 987 | 68
Corporate Bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | 100,236 | 57,404
Unrealized Loss, Less than 12 Months | (563) | (195)
Fair Value, Greater than 12 Months | 12,808 | 0
Unrealized Loss, Greater than 12 Months | (237) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 113,044 | 57,404
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 800 | 195
US Government Agencies Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less than 12 Months | 3,914 | 0
Unrealized Loss, Less than 12 Months | (7) | 0
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 | 3,914 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 7 | $ 0

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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