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Investments (Schedule of Investment Securities, Aggregated by Investment Type and Length of Time) (Details)
$ in Thousands
12 Months Ended
Jun. 26, 2016
USD ($)
Jun. 28, 2015
USD ($)
Jun. 29, 2014
USD ($)
Schedule of Available-for-sale Securities [Line Items]      
Fair Value, Less than 12 Months $ 30,514 $ 99,840  
Unrealized Loss, Less than 12 Months (82) (484)  
Fair Value, Greater than 12 Months 3,535 1,812  
Unrealized Loss, Greater than 12 Months (6) (15)  
Fair Value, Total 34,049 101,652  
Unrealized Loss, Total $ (88) $ (499)  
Number of securities with an unrealized loss, Less than 12 Months 22 54  
Number of securities with an unrealized loss, Greater than 12 Months 3 1  
Number of securities with an unrealized loss, Total 25 55  
Available-for-sale Securities, Gross Realized Gain (Loss) $ 238 $ 925 $ 68
Municipal bonds      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value, Less than 12 Months 2,936 53,204  
Unrealized Loss, Less than 12 Months (9) (341)  
Fair Value, Greater than 12 Months 3,535 0  
Unrealized Loss, Greater than 12 Months (6) 0  
Fair Value, Total 6,471 53,204  
Unrealized Loss, Total (15) (341)  
Corporate bonds      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value, Less than 12 Months 27,578 46,636  
Unrealized Loss, Less than 12 Months (73) (143)  
Fair Value, Greater than 12 Months 0 1,812  
Unrealized Loss, Greater than 12 Months 0 (15)  
Fair Value, Total 27,578 48,448  
Unrealized Loss, Total $ (73) $ (158)