Financial Instruments And Fair Value (Summary Of Financial Assets And Liabilities At Fair Value) (Details) (USD $) In Millions	Jul. 29, 2011
Foreign currency contracts	$ 4.2
Total	3,899.3
Municipal Bonds [Member]
Total	1.5
Municipal Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Total	0
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Total	1.5
Municipal Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Total	0
Commercial Paper [Member]
Total	131.6
Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member]
Total	0
Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member]
Total	131.6
Commercial Paper [Member] | Fair Value, Inputs, Level 3 [Member]
Total	0
Certificates Of Deposit [Member]
Total	111.8
Certificates Of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]
Total	0
Certificates Of Deposit [Member] | Fair Value, Inputs, Level 2 [Member]
Total	111.8
Certificates Of Deposit [Member] | Fair Value, Inputs, Level 3 [Member]
Total	0
Money Market Funds [Member]
Total	1,524.7
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Total	1,524.7
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Total	0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Total	0
Private Equity Fund [Member]
Total	1.0
Private Equity Fund [Member] | Fair Value, Inputs, Level 1 [Member]
Total	0
Private Equity Fund [Member] | Fair Value, Inputs, Level 2 [Member]
Total	0
Private Equity Fund [Member] | Fair Value, Inputs, Level 3 [Member]
Total	1.0
Foreign Currency Contracts [Member]
Foreign currency contracts	1.6
Foreign Currency Contracts [Member] | Fair Value, Inputs, Level 1 [Member]
Foreign currency contracts	0
Foreign Currency Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
Foreign currency contracts	1.6
Foreign Currency Contracts [Member] | Fair Value, Inputs, Level 3 [Member]
Foreign currency contracts	0
Equity Funds [Member]
Total	23.6
Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Total	23.6
Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Total	0
Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Total	0
Corporate Bonds [Member]
Total	2,047.2
Corporate Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Total	0
Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Total	2,047.2
Corporate Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Total	0
Auction Rate Securities [Member]
Total	56.3
Auction Rate Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Total	0
Auction Rate Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Total	0
Auction Rate Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Total	56.3
Fair Value, Inputs, Level 1 [Member]
Foreign currency contracts	0
Total	1,548.3
Fair Value, Inputs, Level 2 [Member]
Foreign currency contracts	4.2
Total	2,293.7
Fair Value, Inputs, Level 3 [Member]
Foreign currency contracts	0
Total	$ 57.3