v2.4.0.6
Additional Information Pertaining to Restricted Equity Awards Activity (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Jul. 28, 2012
Jul. 30, 2011
Jul. 31, 2010
Service-based Restricted Equity Awards
     
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]      
Weighted-average grant date fair value of awards granted $ 15.10 $ 13.53 $ 10.18
Total fair value of awards vested (millions) $ 5.0 $ 1.5 $ 1.9
Performance-based Restricted Equity Awards
     
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]      
Weighted-average grant date fair value of awards granted $ 12.74 $ 13.02 $ 8.91
Market-based Restricted Equity Awards
     
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]      
Weighted-average grant date fair value of awards granted $ 12.33 $ 13.77 $ 7.62