Investments (Contractual Maturities of Short-term Investments by Type) (Details) - USD ($) $ in Thousands	Mar. 27, 2016	Jun. 28, 2015
Schedule of Available-for-sale Securities [Line Items]
Within One Year	$ 196,807
After One, Within Five Years	238,990
After Five, Within Ten Years	69,091
After Ten Years	0
Total	504,888	$ 573,481
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Within One Year	26,540
After One, Within Five Years	130,981
After Five, Within Ten Years	33,305
After Ten Years	0
Total	190,826
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Within One Year	25,267
After One, Within Five Years	104,509
After Five, Within Ten Years	35,786
After Ten Years	0
Total	165,562
U.S. | Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Within One Year	0
After One, Within Five Years	3,500
After Five, Within Ten Years	0
After Ten Years	0
Total	3,500
Non-US [Member] | Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Within One Year	145,000
After One, Within Five Years	0
After Five, Within Ten Years	0
After Ten Years	0
Total	$ 145,000