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Property and Equipment - Additional Information (Detail) (USD $)
 1 Months Ended 9 Months Ended 12 Months Ended
May 31, 2012
acre
sqft
Apr. 28, 2012
sqft
Apr. 28, 2012
Jul. 28, 2012
Jul. 30, 2011
Jul. 31, 2010
Property, Plant and Equipment [Line Items]            
Sale of New York Facility, square-foot of building sold 900,000          
Sale of New York Facility, acres of land sold 16          
Sale of New York Facility, property, selling price $ 40,000,000          
Sale of New York Facility, leaseback agreement, period Company entered into a two-year leaseback for a minor portion of the building of approximately 124,000 square-feet of office space, which is cancelable at any time subject to a 10-day notice period.          
Sale of New York Facility, leaseback agreement, sq. ft. leased 124,000          
Sale of New York Facility, gain on sales-leaseback of property in the fourth quarter of Fiscal 2012 6,900,000          
Capital Expenditures, including purchase of New Jersey Office Building   14,600,000   150,400,000 [1] 102,100,000 [1] 65,200,000 [1]
Purchase of New Jersey Office Building, square-foot of building purchased   137,000        
Purchase of New Jersey Office Building, annual tax credit     3,200,000      
Purchase of New Jersey Office Building, tax credit, expiration period   10 years 10 years      
Maximum
            
Property, Plant and Equipment [Line Items]            
Purchase of New Jersey Office Building, annual tax credit     32,400,000      
Maximum | Over the ten year grant period
            
Property, Plant and Equipment [Line Items]            
Expected cash grants, per employee       50,000    
Expected cash grants       6,000,000    
Minimum
            
Property, Plant and Equipment [Line Items]            
Purchase of New Jersey Office Building, percentage of property face value limited to sale, under tax credit limitation   75.00% 75.00%      
Minimum | Over the ten year grant period
            
Property, Plant and Equipment [Line Items]            
Expected cash grants       $ 4,000,000    
[1] Excludes non-cash capital expenditures of $13.4 million in Fiscal 2012, $3.6 million in Fiscal 2011 and $6.5 million in Fiscal 2010.