Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2013	Aug. 25, 2012	Aug. 27, 2011
Statement Of Income And Comprehensive Income [Abstract]
Pension liability adjustments, taxes	$ 27,972	$ 29,744	$ 3,998
Unrealized loss adjustment on marketable securities net of taxes	202	69	91
Net losses on outstanding derivatives, taxes	$ 440	$ 4,800	$ 0