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Investments (Schedule of Investment Securities, Aggregated by Investment Type and Length of Time) (Details)
$ in Thousands
 12 Months Ended
Jun. 24, 2018
USD ($)
Jun. 25, 2017
USD ($)
Jun. 26, 2016
USD ($)
Schedule of Available-for-sale Securities [Line Items]      
Fair Value, Less than 12 Months $ 162,807 $ 84,220  
Unrealized Loss, Less than 12 Months (1,987) (263)  
Fair Value, Greater than 12 Months 5,128 0  
Unrealized Loss, Greater than 12 Months (140) 0  
Fair Value, Total 167,935 84,220  
Unrealized Loss, Total $ (2,127) $ (263)  
Number of securities with an unrealized loss, Less than 12 Months 151 67  
Number of securities with an unrealized loss, Greater than 12 Months 6 0  
Number of securities with an unrealized loss, Total 157 67  
Available-for-sale Securities, Gross Realized Gain (Loss) $ (86) $ 93 $ 238
Municipal bonds      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value, Less than 12 Months 97,470 26,816  
Unrealized Loss, Less than 12 Months (861) (68)  
Fair Value, Greater than 12 Months 3,642 0  
Unrealized Loss, Greater than 12 Months (78) 0  
Fair Value, Total 101,112 26,816  
Unrealized Loss, Total (939) (68)  
Corporate bonds      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value, Less than 12 Months 61,453 57,404  
Unrealized Loss, Less than 12 Months (1,088) (195)  
Fair Value, Greater than 12 Months 1,486 0  
Unrealized Loss, Greater than 12 Months (62) 0  
Fair Value, Total 62,939 57,404  
Unrealized Loss, Total (1,150) (195)  
U.S. agency securities      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value, Less than 12 Months 3,884 0  
Unrealized Loss, Less than 12 Months (38) 0  
Fair Value, Greater than 12 Months 0 0  
Unrealized Loss, Greater than 12 Months 0 0  
Fair Value, Total 3,884 0  
Unrealized Loss, Total $ (38) $ 0