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Investments (Schedule of Investment Securities, Aggregated by Investment Type and Length of Time) (Details)
$ in Thousands
 12 Months Ended
Jun. 28, 2015
USD ($)
Jun. 29, 2014
USD ($)
Jun. 30, 2013
USD ($)
Schedule of Available-for-sale Securities [Line Items]      
Fair Value, Less than 12 Months $ 99,840 $ 23,602  
Unrealized Loss, Less than 12 Months (484) (39)  
Fair Value, Greater than 12 Months 1,812 14,569  
Unrealized Loss, Greater than 12 Months (15) (87)  
Fair Value, Total 101,652 38,171  
Unrealized Loss, Total $ (499) $ (126)  
Number of securities with an unrealized loss, Less than 12 Months 54 13  
Number of securities with an unrealized loss, Greater than 12 Months 1 7  
Number of securities with an unrealized loss, Total 55 20  
Available-for-sale Securities, Gross Realized Gain (Loss) $ 925 $ 68 $ 111
Municipal bonds      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value, Less than 12 Months 53,204 7,906  
Unrealized Loss, Less than 12 Months (341) (8)  
Fair Value, Greater than 12 Months 0 1,520  
Unrealized Loss, Greater than 12 Months 0 (4)  
Fair Value, Total 53,204 9,426  
Unrealized Loss, Total (341) (12)  
Corporate bonds      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value, Less than 12 Months 46,636 15,696  
Unrealized Loss, Less than 12 Months (143) (31)  
Fair Value, Greater than 12 Months 1,812 13,049  
Unrealized Loss, Greater than 12 Months (15) (83)  
Fair Value, Total 48,448 28,745  
Unrealized Loss, Total $ (158) $ (114)