Consolidated Balance Sheets (Parenthetical) (USD $)	Jan. 29, 2012	Jul. 31, 2011
Statement of Financial Position [Abstract]
Preferred stock, shares authorized	40,000,000	40,000,000
Preferred stock, shares issued	0	0
Capital stock, par value	$ 0.0375	$ 0.0375
Capital stock, shares authorized	560,000,000	560,000,000
Capital stock, shares issued	542,000,000	542,000,000