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Equity - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 9 Months Ended
Apr. 03, 2012
Sep. 22, 2011
Apr. 28, 2012
Apr. 30, 2011
Jul. 30, 2011
Stockholders Equity Note [Line Items]          
Share repurchase program authorized amount   $ 100      
Stock repurchase program remaining authorized repurchase amount   127.1 89.9    
Purchases of common stock, shares     2.7    
Purchases of common stock     37.2 47.4 [1]  
Common stock split through stock dividend, description a two-for-one common stock split        
Common stock split through stock dividend, percentage 100.00%        
Common stock, outstanding 77.0   154.0   154.8
Increase in common stock and corresponding decrease in additional-paid-in-capital as a result of the stock split $ 0.8        
[1] Includes amounts attributable to a non-controlling interest of $1.4 million as of July 31, 2010 and $1.6 million as of April 30, 2011. The Company sold its interest in its majority-owned investment during the fourth quarter of Fiscal 2011, thereby eliminating the non-controlling interest.