Auction Rate Securities (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2012	Jun. 25, 2011	Jun. 26, 2010
Auction Rate Securities (Additional Textual) [Abstract]
Contractual maturity of ARS investment	Greater than five years
Auction Rate Securities with fair value maturing from 2016 to 2018	$ 8.9
Auction Rate Securities with fair value maturing from 2040 to 2046	6.4
ARS investments, investment grade	8.9
ARS investments, below investment grade	18.5
Auction Rate Securities [Member]
Auction Rate Securities (Textual) [Abstract]
ARS investments redeemed at par	$ 10.1	$ 3.2	$ 1.8