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Equity (Summary Of Changes In Equity) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Oct. 27, 2012
Oct. 29, 2011
Equity [Abstract]    
Balance at beginning of period $ 1,340.9 $ 1,158.0
Total comprehensive income 43.5 47.1
Other (6.9)  
Purchases of common stock   (28.7)
Shares issued and equity grants made pursuant to stock-based compensation plans 28.1 9.6
Balance at end of period $ 1,405.6 $ 1,186.0