Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 15, 2014	Feb. 09, 2013	Feb. 15, 2014	Feb. 09, 2013
Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, taxes	$ 600	$ 1,300	$ 1,300	$ 3,200
Net Unrealized Gain on Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, taxes	11	14	13	27
Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, taxes	$ 15	$ 155	$ 31	$ 258