Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive Loss (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	May 09, 2015	May 10, 2014	May 09, 2015	May 10, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, pension, taxes	$ 807	$ 630	$ 2,449	$ 1,898
Reclassification from accumulated other comprehensive income, securities, taxes	69	7	22	85
Reclassification from accumulated other comprehensive income, derivatives, taxes	264	17	49	48
Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, pension, taxes	807	630	2,449	1,898
Net Unrealized Gain on Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, securities, taxes	4	19	11	33
Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, derivatives, taxes	$ 15	$ 17	$ 49	$ 48