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Financial Instruments And Fair Value (Summary Of Financial Assets And Liabilities Measured At Fair Value On A Recurring Basis By Balance Sheet Grouping) (Details) (USD $)
In Millions, unless otherwise specified
Jan. 27, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash equivalents $ 1,666.3
Short-term investments 2,445.2
Other current assets 9.8
Other non-current assets 71.0
Total 4,192.3
Other current liabilities 3.8
Fair Value, Inputs, Level 1 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash equivalents 1,612.1
Short-term investments 0
Other current assets 5.3
Other non-current assets 19.0
Total 1,636.4
Other current liabilities 0
Fair Value, Inputs, Level 2 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash equivalents 54.2
Short-term investments 2,445.2
Other current assets 4.5
Other non-current assets 0
Total 2,503.9
Other current liabilities 3.8
Fair Value, Inputs, Level 3 [Member]
  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Cash equivalents 0
Short-term investments 0
Other current assets 0
Other non-current assets 52.0
Total 52.0
Other current liabilities $ 0