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Property and Equipment - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 9 Months Ended
Apr. 28, 2012
acre
sqft
Apr. 28, 2012
sqft
Apr. 30, 2011
Jul. 30, 2011
Property, Plant and Equipment [Line Items]        
Sale of New York Facility, square-foot of building to be sold 900,000      
Sale of New York Facility, acres of land to be sold 16      
Sale of New York Facility, property, selling price $ 40.0      
Sale of New York Facility, leaseback agreement, period 2 years      
Sale of New York Facility, leaseback agreement, sq. ft. leased 124,000 124,000    
Sale of New York Facility, lease cancellation notice period 10 days      
Assets held for sale 29.9 29.9   0
Capital Expenditures, including purchase of New Jersey Office Building 14.6 102.7 74.3  
Purchase of New Jersey Office Building, square-foot of building purchased 129,000 129,000    
Purchase of New Jersey Office Building, annual tax credit   3.2    
Purchase of New Jersey Office Building, tax credit, expiration period 10 years 10 years    
Minimum
        
Property, Plant and Equipment [Line Items]        
Sale of New York Facility, gain on sales-leaseback of property in the fourth quarter of Fiscal 2012 5 5    
Purchase of New Jersey Office Building, percentage of property face value limited to sale, under tax credit limitation 75.00% 75.00%    
Maximum
        
Property, Plant and Equipment [Line Items]        
Sale of New York Facility, gain on sales-leaseback of property in the fourth quarter of Fiscal 2012 10 10    
Purchase of New Jersey Office Building, annual tax credit   $ 32.4