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Cost and Fair Value of Financial Instruments (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2010
Jan. 31, 2009
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents $ 1,156.9 $ 1,075.1 $ 838.7 $ 917.6
Derivative Instruments And Hedges at Amortized Cost, Net 11.6 3.9 [1]    
Unrealized Gain on Foreign Currency Derivatives, before Tax 6.5 1.9 [1]    
Unrealized Loss on Foreign Currency Derivatives, before Tax (2.2) (1.9) [1]    
Derivative, Fair Value, Net 15.9 3.9 [1]    
Amortized Cost Securities 1,327.7 1,150.3    
Unrealized Gain on Securities 9.8 5.6    
Unrealized Loss on Securities (2.5) (2.1)    
Total 1,335.0 1,153.8    
Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Trading Securities 29.8 29.7    
Trading Securities, Unrealized Holding Gain 1.8 1.7    
Trading Securities, Unrealized Holding Loss (0.1) (0.1)    
Trading Securities, Fair Value Disclosure   31.3    
Other Assets
       
Schedule of Available-for-sale Securities [Line Items]        
Convertible Debt Securities, Amortized Cost 18.3      
Convertible Debt Securities, Unrealized Gains 0      
Convertible Debt Securities, Unrealized Losses 0      
Convertible Debt Securities, Fair Value Disclosure 18.3      
Fair Value, Inputs, Level 1
       
Schedule of Available-for-sale Securities [Line Items]        
Derivative, Fair Value, Net 0 0 [1]    
Total 340.6 458.4    
Fair Value, Inputs, Level 1 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Trading Securities, Fair Value Disclosure 31.5 31.3    
Fair Value, Inputs, Level 1 | Other Assets
       
Schedule of Available-for-sale Securities [Line Items]        
Convertible Debt Securities, Fair Value Disclosure 0      
Fair Value, Inputs, Level 2
       
Schedule of Available-for-sale Securities [Line Items]        
Derivative, Fair Value, Net 9.7 3.9 [1]    
Total 965.7 691.2    
Fair Value, Inputs, Level 2 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Trading Securities, Fair Value Disclosure 0 0    
Fair Value, Inputs, Level 2 | Other Assets
       
Schedule of Available-for-sale Securities [Line Items]        
Convertible Debt Securities, Fair Value Disclosure 0      
Fair Value, Inputs, Level 3
       
Schedule of Available-for-sale Securities [Line Items]        
Derivative, Fair Value, Net 6.2 0 [1]    
Total 28.7 4.2    
Fair Value, Inputs, Level 3 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Trading Securities, Fair Value Disclosure 0 0    
Fair Value, Inputs, Level 3 | Other Assets
       
Schedule of Available-for-sale Securities [Line Items]        
Convertible Debt Securities, Fair Value Disclosure 18.3      
Commercial paper and corporate securities | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 143.7 47.6    
Available-for-sale Securities, Gross Unrealized Gains 0.1 0.1    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Fair Value Disclosure 143.8 47.7    
Commercial paper and corporate securities | Fair Value, Inputs, Level 1 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 35.3 37.7    
Commercial paper and corporate securities | Fair Value, Inputs, Level 2 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 108.5 10.0    
Commercial paper and corporate securities | Fair Value, Inputs, Level 3 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Certificates of deposit and time deposits | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 5.2 29.0    
Available-for-sale Securities, Gross Unrealized Gains 0 0    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Fair Value Disclosure 5.2 29.0    
Certificates of deposit and time deposits | Fair Value, Inputs, Level 1 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 25.0    
Certificates of deposit and time deposits | Fair Value, Inputs, Level 2 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 5.2 4.0    
Certificates of deposit and time deposits | Fair Value, Inputs, Level 3 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
U.S. Treasury Securities | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 30.7 26.0    
Available-for-sale Securities, Gross Unrealized Gains 0 0    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Fair Value Disclosure 30.7 26.0    
U.S. Treasury Securities | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 23.6 12.7    
Available-for-sale Securities, Gross Unrealized Gains 0.2 0.1    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Fair Value Disclosure 23.8 12.8    
U.S. Treasury Securities | Fair Value, Inputs, Level 1 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 30.7 26.0    
U.S. Treasury Securities | Fair Value, Inputs, Level 1 | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 23.8 12.8    
U.S. Treasury Securities | Fair Value, Inputs, Level 2 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
U.S. Treasury Securities | Fair Value, Inputs, Level 2 | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
U.S. Treasury Securities | Fair Value, Inputs, Level 3 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
U.S. Treasury Securities | Fair Value, Inputs, Level 3 | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
US government agency securities | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 38.2 47.2    
Available-for-sale Securities, Gross Unrealized Gains 0 0    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Fair Value Disclosure 38.2 47.2    
US government agency securities | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 51.4 12.7    
Available-for-sale Securities, Gross Unrealized Gains 0.2 0.2    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Fair Value Disclosure 51.6 12.9    
US government agency securities | Fair Value, Inputs, Level 1 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 38.2 47.2    
US government agency securities | Fair Value, Inputs, Level 1 | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 51.6 12.9    
US government agency securities | Fair Value, Inputs, Level 2 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
US government agency securities | Fair Value, Inputs, Level 2 | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
US government agency securities | Fair Value, Inputs, Level 3 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
US government agency securities | Fair Value, Inputs, Level 3 | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Municipal securities | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 4.7 8.6    
Available-for-sale Securities, Gross Unrealized Gains 0 0    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Fair Value Disclosure 4.7 8.6    
Municipal securities | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 4.6 4.7    
Available-for-sale Securities, Gross Unrealized Gains 0 0    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Fair Value Disclosure 4.6 4.7    
Municipal securities | Fair Value, Inputs, Level 1 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 4.7 8.6    
Municipal securities | Fair Value, Inputs, Level 1 | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 4.6 4.7    
Municipal securities | Fair Value, Inputs, Level 2 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Municipal securities | Fair Value, Inputs, Level 2 | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Municipal securities | Fair Value, Inputs, Level 3 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Municipal securities | Fair Value, Inputs, Level 3 | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Other | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 0.3 0.3    
Available-for-sale Securities, Gross Unrealized Gains 0 0    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Fair Value Disclosure 0.3 0.3    
Other | Fair Value, Inputs, Level 1 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0.3 0.3    
Other | Fair Value, Inputs, Level 2 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Other | Fair Value, Inputs, Level 3 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Sovereign Debt | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis   9.1    
Available-for-sale Securities, Gross Unrealized Gains   0    
Available-for-sale Securities, Gross Unrealized Losses   0    
Available-for-sale Securities, Fair Value Disclosure   9.1    
Sovereign Debt | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis   3.9    
Available-for-sale Securities, Gross Unrealized Gains   0.1    
Available-for-sale Securities, Gross Unrealized Losses   0    
Available-for-sale Securities, Fair Value Disclosure   4.0    
Sovereign Debt | Fair Value, Inputs, Level 1 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure   0    
Sovereign Debt | Fair Value, Inputs, Level 1 | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure   0    
Sovereign Debt | Fair Value, Inputs, Level 2 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure   9.1    
Sovereign Debt | Fair Value, Inputs, Level 2 | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure   4.0    
Sovereign Debt | Fair Value, Inputs, Level 3 | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure   0    
Sovereign Debt | Fair Value, Inputs, Level 3 | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure   0    
Corporate debt securities | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 107.8 152.6    
Available-for-sale Securities, Gross Unrealized Gains 1.0 1.5    
Available-for-sale Securities, Gross Unrealized Losses (0.2) (0.1)    
Available-for-sale Securities, Fair Value Disclosure 108.6 154.0    
Corporate debt securities | Fair Value, Inputs, Level 1 | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 108.6 154.0    
Corporate debt securities | Fair Value, Inputs, Level 2 | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Corporate debt securities | Fair Value, Inputs, Level 3 | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Taxable auction rate securities | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Amortized Cost Basis 4.2 4.2    
Available-for-sale Securities, Gross Unrealized Gains 0 0    
Available-for-sale Securities, Gross Unrealized Losses 0 0    
Available-for-sale Securities, Fair Value Disclosure 4.2 4.2    
Taxable auction rate securities | Fair Value, Inputs, Level 1 | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Taxable auction rate securities | Fair Value, Inputs, Level 2 | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 0 0    
Taxable auction rate securities | Fair Value, Inputs, Level 3 | Marketable Securities, Noncurrent
       
Schedule of Available-for-sale Securities [Line Items]        
Available-for-sale Securities, Fair Value Disclosure 4.2 4.2    
Certificates of deposit and time deposits
       
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents 493.6 [2] 383.3 [2]    
Cash and Cash Equivalents, Fair Value Disclosure 493.6 [2] 383.3 [2]    
Certificates of deposit and time deposits | Fair Value, Inputs, Level 1
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 11.3 [2] 97.9 [2]    
Certificates of deposit and time deposits | Fair Value, Inputs, Level 2
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 482.3 [2] 285.4 [2]    
Certificates of deposit and time deposits | Fair Value, Inputs, Level 3
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 0 [2] 0 [2]    
Commercial Paper
       
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents 297.9 [2] 331.0 [2]    
Cash and Cash Equivalents, Fair Value Disclosure 297.9 [2] 331.0 [2]    
Commercial Paper | Fair Value, Inputs, Level 1
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 0 [2] 0 [2]    
Commercial Paper | Fair Value, Inputs, Level 2
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 297.9 [2] 331.0 [2]    
Commercial Paper | Fair Value, Inputs, Level 3
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 0 [2] 0 [2]    
Money Market Funds
       
Schedule of Available-for-sale Securities [Line Items]        
Cash equivalents 62.1 [2] 43.8 [2]    
Cash and Cash Equivalents, Fair Value Disclosure 62.1 [2] 43.8 [2]    
Money Market Funds | Fair Value, Inputs, Level 1
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 0 [2] 0 [2]    
Money Market Funds | Fair Value, Inputs, Level 2
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 62.1 [2] 43.8 [2]    
Money Market Funds | Fair Value, Inputs, Level 3
       
Schedule of Available-for-sale Securities [Line Items]        
Cash and Cash Equivalents, Fair Value Disclosure 0 [2] 0 [2]    
Rabbi Trust | Marketable Securities, Current
       
Schedule of Available-for-sale Securities [Line Items]        
Trading Securities, Fair Value Disclosure $ 31.5      
[1] Included in “Prepaid expenses and other current assets,” "Other assets," or “Other accrued liabilities” in the accompanying Consolidated Balance Sheets.
[2] Included in “Cash and cash equivalents” in the accompanying Consolidated Balance Sheets.