Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 15, 2014	Feb. 09, 2013	Feb. 15, 2014	Feb. 09, 2013
Statement Of Income And Comprehensive Income [Abstract]
Pension liability adjustments, taxes	$ 632	$ 1,295	$ 1,268	$ 3,193
Unrealized (losses) gains on marketable securities, taxes	24	36	92	31
Net derivative activities, taxes	$ 15	$ 155	$ 31	$ 258