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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
Sep. 27, 2015
USD ($)
Jun. 28, 2015
USD ($)
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less than 12 Months $ 72,320 $ 99,840
Unrealized Loss, Less than 12 Months (208) (484)
Fair Value, Greater than 12 Months 1,795 1,812
Unrealized Loss, Greater than 12 Months (13) (15)
Fair Value, Total 74,115 101,652
Unrealized Loss, Total $ (221) $ (499)
Number of Securities with an Unrealized Loss, Less than 12 Months 36 54
Number of Securities with an Unrealized Loss, Greater than 12 Months 1 1
Number of Securities with an Unrealized Loss, Total 37 55
Municipal Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less than 12 Months $ 25,072 $ 53,204
Unrealized Loss, Less than 12 Months (91) (341)
Fair Value, Greater than 12 Months 0 0
Unrealized Loss, Greater than 12 Months 0 0
Fair Value, Total 25,072 53,204
Unrealized Loss, Total (91) (341)
Corporate Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value, Less than 12 Months 47,248 46,636
Unrealized Loss, Less than 12 Months (117) (143)
Fair Value, Greater than 12 Months 1,795 1,812
Unrealized Loss, Greater than 12 Months (13) (15)
Fair Value, Total 49,043 48,448
Unrealized Loss, Total $ (130) $ (158)