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Financial Instruments Cost and Fair Value of Financial Instuments (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Apr. 30, 2012
Jan. 31, 2012
Apr. 30, 2011
Jan. 31, 2011
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, at Carrying Value $ 1,074.5 $ 1,156.9 $ 1,091.4 $ 1,075.1
Amortized Cost Securities 1,491.7 1,327.7    
Unrealized Gain on Securities 13.9 9.8    
Unrealized Loss on Securities (3.9) (2.5)    
Fair Value, Assets Measured on Recurring Basis 1,501.7 1,335.0    
Derivative [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Gross Unrealized Gains 7.7 [1] 6.5 [1]    
Available-for-sale Securities, Gross Unrealized Losses 0.5 [1] 2.2 [1]    
Available-for-sale Securities, Amortized Cost Basis 12.2 [1] 11.6 [1]    
Available-for-sale Securities, Fair Value Disclosure 19.4 [1] 15.9 [1]    
Certificates of deposit and time deposits [member]
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, at Carrying Value 298.9 [2] 493.6 [2]    
Available-for-sale Securities, Gross Unrealized Gains 0 [2] 0 [2]    
Available-for-sale Securities, Gross Unrealized Losses 0 [2] 0 [2]    
Cash and Cash Equivalents, Fair Value Disclosure 298.9 [2] 493.6 [2]    
Commercial Paper [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, at Carrying Value 256.7 [2] 297.9 [2]    
Available-for-sale Securities, Gross Unrealized Gains 0 [2] 0 [2]    
Available-for-sale Securities, Gross Unrealized Losses 0 [2] 0 [2]    
Cash and Cash Equivalents, Fair Value Disclosure 256.7 [2] 297.9 [2]    
Money Market Funds [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, at Carrying Value 185.2 [2] 62.1 [2]    
Available-for-sale Securities, Gross Unrealized Gains 0 [2] 0 [2]    
Available-for-sale Securities, Gross Unrealized Losses 0 [2] 0 [2]    
Cash and Cash Equivalents, Fair Value Disclosure 185.2 [2] 62.1 [2]    
US Government Corporations and Agencies Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, at Carrying Value 1.0 [2]      
Available-for-sale Securities, Gross Unrealized Gains 0 [2]      
Available-for-sale Securities, Gross Unrealized Losses 0 [2]      
Cash and Cash Equivalents, Fair Value Disclosure 1.0 [2]      
Level 1 [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Derivative, Fair Value, Net 0 0    
Fair Value, Assets Measured on Recurring Basis 455.0 340.6    
Level 1 [Member] | Certificates of deposit and time deposits [member]
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 19.5 11.3    
Level 1 [Member] | Commercial Paper [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 0 0    
Level 1 [Member] | Money Market Funds [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 0 0    
Level 1 [Member] | US Government Corporations and Agencies Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 1.0      
Level 2 [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Derivative, Fair Value, Net 7.8 9.7    
Fair Value, Assets Measured on Recurring Basis 1,012.0 965.7    
Level 2 [Member] | Certificates of deposit and time deposits [member]
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 279.4 482.3    
Level 2 [Member] | Commercial Paper [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 256.7 297.9    
Level 2 [Member] | Money Market Funds [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 185.2 62.1    
Level 2 [Member] | US Government Corporations and Agencies Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 0      
Level 3 [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Derivative, Fair Value, Net 11.6 6.2    
Fair Value, Assets Measured on Recurring Basis 34.7 28.7    
Level 3 [Member] | Certificates of deposit and time deposits [member]
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 0 0    
Level 3 [Member] | Commercial Paper [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 0 0    
Level 3 [Member] | Money Market Funds [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 0 0    
Level 3 [Member] | US Government Corporations and Agencies Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 0      
Marketable Securities, Current [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Trading Securities 32.0 29.8    
Trading Securities, Unrealized Holding Gain 2.7 1.8    
Trading Securities, Unrealized Holding Loss 0 0.1    
Trading Securities, Fair Value Disclosure 34.7 31.5    
Marketable Securities, Current [Member] | Commercial paper and corporate securities [member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Gross Unrealized Gains 0 0.1    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Amortized Cost Basis 158.4 143.7    
Available-for-sale Securities, Fair Value Disclosure 158.4 143.8    
Marketable Securities, Current [Member] | Certificates of deposit and time deposits [member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Gross Unrealized Gains 0 0    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Amortized Cost Basis 155.1 5.2    
Available-for-sale Securities, Fair Value Disclosure 155.1 5.2    
Marketable Securities, Current [Member] | US Treasury Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Gross Unrealized Gains 0 0    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Amortized Cost Basis 29.9 30.7    
Available-for-sale Securities, Fair Value Disclosure 29.9 30.7    
Marketable Securities, Current [Member] | US Government Agencies Debt Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Gross Unrealized Gains 0 0    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Amortized Cost Basis 53.3 38.2    
Available-for-sale Securities, Fair Value Disclosure 53.3 38.2    
Marketable Securities, Current [Member] | US States and Political Subdivisions Debt Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Gross Unrealized Gains 0 0    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Amortized Cost Basis 5.8 4.7    
Available-for-sale Securities, Fair Value Disclosure 5.8 4.7    
Marketable Securities, Current [Member] | Other [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Gross Unrealized Gains 0 0    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Amortized Cost Basis 0.3 0.3    
Available-for-sale Securities, Fair Value Disclosure 0.3 0.3    
Marketable Securities, Current [Member] | Level 1 [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Trading Securities, Fair Value Disclosure 34.7 31.5    
Marketable Securities, Current [Member] | Level 1 [Member] | Commercial paper and corporate securities [member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 31.6 35.3    
Marketable Securities, Current [Member] | Level 1 [Member] | Certificates of deposit and time deposits [member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Current [Member] | Level 1 [Member] | US Treasury Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 29.9 30.7    
Marketable Securities, Current [Member] | Level 1 [Member] | US Government Agencies Debt Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 53.3 38.2    
Marketable Securities, Current [Member] | Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 5.8 4.7    
Marketable Securities, Current [Member] | Level 1 [Member] | Other [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0.3 0.3    
Marketable Securities, Current [Member] | Level 2 [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Trading Securities, Fair Value Disclosure 0 0    
Marketable Securities, Current [Member] | Level 2 [Member] | Commercial paper and corporate securities [member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 126.8 108.5    
Marketable Securities, Current [Member] | Level 2 [Member] | Certificates of deposit and time deposits [member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 155.1 5.2    
Marketable Securities, Current [Member] | Level 2 [Member] | US Treasury Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Current [Member] | Level 2 [Member] | US Government Agencies Debt Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Current [Member] | Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Current [Member] | Level 2 [Member] | Other [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Current [Member] | Level 3 [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Trading Securities, Fair Value Disclosure 0 0    
Marketable Securities, Current [Member] | Level 3 [Member] | Commercial paper and corporate securities [member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Current [Member] | Level 3 [Member] | Certificates of deposit and time deposits [member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Current [Member] | Level 3 [Member] | US Treasury Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Current [Member] | Level 3 [Member] | US Government Agencies Debt Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Current [Member] | Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Current [Member] | Level 3 [Member] | Other [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Noncurrent [Member] | US Treasury Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Gross Unrealized Gains 0.3 0.2    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Amortized Cost Basis 96.5 23.6    
Available-for-sale Securities, Fair Value Disclosure 96.8 23.8    
Marketable Securities, Noncurrent [Member] | US Government Agencies Debt Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Gross Unrealized Gains 0.1 0.2    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Amortized Cost Basis 51.8 51.4    
Available-for-sale Securities, Fair Value Disclosure 51.9 51.6    
Marketable Securities, Noncurrent [Member] | US States and Political Subdivisions Debt Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Gross Unrealized Gains 0.1 0    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Amortized Cost Basis 5.8 4.6    
Available-for-sale Securities, Fair Value Disclosure 5.9 4.6    
Marketable Securities, Noncurrent [Member] | Sovereign Debt [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Gross Unrealized Gains 0      
Available-for-sale Securities, Gross Unrealized Losses 0      
Available-for-sale Securities, Amortized Cost Basis 1.0      
Available-for-sale Securities, Fair Value Disclosure 1.0      
Marketable Securities, Noncurrent [Member] | Corporate Debt Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Gross Unrealized Gains 1.0 1.0    
Available-for-sale Securities, Gross Unrealized Losses 0.1 0.2    
Available-for-sale Securities, Amortized Cost Basis 123.4 107.8    
Available-for-sale Securities, Fair Value Disclosure 124.3 108.6    
Marketable Securities, Noncurrent [Member] | Taxable Auction Rate Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Gross Unrealized Gains 0 0    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Amortized Cost Basis 4.2 4.2    
Available-for-sale Securities, Fair Value Disclosure 4.2 4.2    
Marketable Securities, Noncurrent [Member] | Level 1 [Member] | US Treasury Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 96.8 23.8    
Marketable Securities, Noncurrent [Member] | Level 1 [Member] | US Government Agencies Debt Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 51.9 51.6    
Marketable Securities, Noncurrent [Member] | Level 1 [Member] | US States and Political Subdivisions Debt Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 5.9 4.6    
Marketable Securities, Noncurrent [Member] | Level 1 [Member] | Sovereign Debt [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0      
Marketable Securities, Noncurrent [Member] | Level 1 [Member] | Corporate Debt Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 124.3 108.6    
Marketable Securities, Noncurrent [Member] | Level 1 [Member] | Taxable Auction Rate Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Noncurrent [Member] | Level 2 [Member] | US Treasury Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Noncurrent [Member] | Level 2 [Member] | US Government Agencies Debt Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Noncurrent [Member] | Level 2 [Member] | US States and Political Subdivisions Debt Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Noncurrent [Member] | Level 2 [Member] | Sovereign Debt [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 1.0      
Marketable Securities, Noncurrent [Member] | Level 2 [Member] | Corporate Debt Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Noncurrent [Member] | Level 2 [Member] | Taxable Auction Rate Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Noncurrent [Member] | Level 3 [Member] | US Treasury Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Noncurrent [Member] | Level 3 [Member] | US Government Agencies Debt Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Noncurrent [Member] | Level 3 [Member] | US States and Political Subdivisions Debt Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Noncurrent [Member] | Level 3 [Member] | Sovereign Debt [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0      
Marketable Securities, Noncurrent [Member] | Level 3 [Member] | Corporate Debt Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Marketable Securities, Noncurrent [Member] | Level 3 [Member] | Taxable Auction Rate Securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 4.2 4.2    
Convertible debt securities [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Convertible Debt Securities, Amortized Cost 20.2 [3] 18.3 [3]    
Convertible Debt Securities, Unrealized Gains 2.0 [3] 0 [3]    
Convertible Debt Securities, Unrealized Losses (3.3) [3] 0 [3]    
Convertible Debt Securities, Fair Value Disclosure 18.9 [3] 18.3 [3]    
Convertible debt securities [Member] | Level 1 [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Convertible Debt Securities, Fair Value Disclosure 0 0    
Convertible debt securities [Member] | Level 2 [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Convertible Debt Securities, Fair Value Disclosure 0 0    
Convertible debt securities [Member] | Level 3 [Member]
       
Schedule of Available-for-sale Securities [Line Items]        
Convertible Debt Securities, Fair Value Disclosure $ 18.9 $ 18.3    
[1] Included in “Prepaid expenses and other current assets,” "Other assets," or “Other accrued liabilities” in the accompanying Condensed Consolidated Balance Sheets.
[2] Included in “Cash and cash equivalents” in the accompanying Condensed Consolidated Balance Sheets.
[3] Included in "Other assets" in the accompanying Condensed Consolidated Balance Sheets.