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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
3 Months Ended
Sep. 24, 2017
USD ($)
Jun. 25, 2017
USD ($)
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 266 $ 263
Document Period End Date Sep. 24, 2017  
Fair Value, Less than 12 Months $ 68,058 84,220
Unrealized Loss, Less than 12 Months (199) (263)
Fair Value, Greater than 12 Months 9,367 0
Unrealized Loss, Greater than 12 Months (67) 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value $ 77,425 $ 84,220
Number of Securities with an Unrealized Loss, Less than 12 Months 53 67
Number of Securities with an Unrealized Loss, Greater than 12 Months 11 0
Number of Securities with an Unrealized Loss, Total 64 67
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 62 $ 68
Fair Value, Less than 12 Months 22,844 26,816
Unrealized Loss, Less than 12 Months (40) (68)
Fair Value, Greater than 12 Months 3,795 0
Unrealized Loss, Greater than 12 Months (22) 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 26,639 26,816
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 204 195
Fair Value, Less than 12 Months 45,214 57,404
Unrealized Loss, Less than 12 Months (159) (195)
Fair Value, Greater than 12 Months 5,572 0
Unrealized Loss, Greater than 12 Months (45) 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value $ 50,786 $ 57,404