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Investments (Contractual Maturities of Short-term Investments by Type) (Details) - USD ($) $ in Thousands	Sep. 23, 2018	Jun. 24, 2018
Debt Securities, Available-for-sale [Line Items]
Within One Year	$ 159,462
After One, Within Five Years	169,361
After Five, Within Ten Years	0
After Ten Years	400
Total short-term investments	329,223	$ 268,161
Variable Rate Demand Obligation [Member]
Debt Securities, Available-for-sale [Line Items]
Within One Year	0
After One, Within Five Years	0
After Five, Within Ten Years	0
After Ten Years	400
Total short-term investments	400
Commercial Paper [Member]
Debt Securities, Available-for-sale [Line Items]
Within One Year	1,978
After One, Within Five Years	0
After Five, Within Ten Years	0
After Ten Years	0
Total short-term investments	1,978
Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Within One Year	23,117
After One, Within Five Years	79,799
After Five, Within Ten Years	0
After Ten Years	0
Total short-term investments	102,916
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Within One Year	61,168
After One, Within Five Years	84,234
After Five, Within Ten Years	0
After Ten Years	0
Total short-term investments	145,402
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Within One Year	3,963
After One, Within Five Years	694
After Five, Within Ten Years	0
After Ten Years	0
Total short-term investments	4,657
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Within One Year	40,351
After One, Within Five Years	3,883
After Five, Within Ten Years	0
After Ten Years	0
Total short-term investments	44,234
Non-US [Member] | Certificates of Deposit [Member]
Debt Securities, Available-for-sale [Line Items]
Within One Year	28,385
After One, Within Five Years	751
After Five, Within Ten Years	0
After Ten Years	0
Total short-term investments	29,136
UNITED STATES | Certificates of Deposit [Member]
Debt Securities, Available-for-sale [Line Items]
Within One Year	500
After One, Within Five Years	0
After Five, Within Ten Years	0
After Ten Years	0
Total short-term investments	$ 500

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