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 10, 2014	May 04, 2013	May 10, 2014	May 04, 2013
Pension Liability [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, taxes	$ 630	$ 1,296	$ 1,898	$ 4,489
Net Unrealized Gain on Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, taxes	19	9	33	38
Derivatives [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from accumulated other comprehensive income, taxes	$ 17	$ 150	$ 48	$ 408