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Restructuring and Other Charges (Details) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended
Apr. 30, 2011
Apr. 30, 2011
Jul. 30, 2011
Maximum [Member]
Jul. 30, 2011
Minimum [Member]
Excess inventories and purchase commitments with contract manufacturers and suppliers $ 115,000,000 $ 115,000,000    
Other 5,000,000 5,000,000    
Total cost of sales 120,000,000 120,000,000    
Workforce reduction 18,000,000 18,000,000    
Impairment of purchased intangible assets 8,000,000 8,000,000    
Other 5,000,000 5,000,000    
Total operating expenses 31,000,000 31,000,000    
Total restructuring and other charges 151,000,000 151,000,000    
Employees impacted due to restructuring plan 350      
Expected pretax charges     $ 1,100,000,000 $ 500,000,000