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Fair Value Measurements
3 Months Ended
Apr. 30, 2011
Fair Value Measurements [Abstract]  
Fair Value Measurements
Note 5 — Fair Value Measurements
The Company’s estimates of the fair value for financial assets and financial liabilities are based on the framework established in the fair value accounting guidance. The framework is based on the inputs used in valuation, gives the highest priority to quoted prices in active markets, and requires that observable inputs be used in the valuations when available. The three levels of the hierarchy are as follows:
    Level 1: observable inputs such as quoted prices in active markets
 
    Level 2: inputs other than the quoted prices in active markets that are observable either directly or indirectly
 
    Level 3: unobservable inputs in which there is little or no market data, which requires the Company to develop its own assumptions
The following table presents financial assets and financial liabilities that the Company measures at fair value on a recurring basis. The Company has classified these financial assets and liabilities in accordance with the fair value hierarchy:
                                 
    Estimated Fair Value Measurements    
            Significant   Significant    
    Quoted Prices in   Observable   Unobservable    
    Active Markets   Other Inputs   Inputs    
(dollars in millions)   (Level 1)   (Level 2)   (Level 3)   Total Fair Value
As of April 30, 2011:
                               
Financial Assets:
                               
Money market funds
  $ 149.3     $     $     $ 149.3  
Foreign currency contracts(2)
  $     $ 0.2     $     $ 0.2  
Financial Liabilities:
                               
Interest rate contract(1)
  $     $ 4.7     $     $ 4.7  
Foreign currency contracts(2)
  $     $ 0.9     $     $ 0.9  
 
                               
As of May 1, 2010:
                               
Financial Assets:
                               
Money market funds
  $ 244.4     $     $     $ 244.4  
Financial Liabilities:
                               
Interest rate contract(1)
  $     $ 12.0     $     $ 12.0  
Foreign currency contracts(2)
  $     $ 0.4     $     $ 0.4  
 
                               
As of January 29, 2011:
                               
Financial Assets:
                               
Money market funds
  $ 174.8     $     $     $ 174.8  
Foreign currency contracts(2)
  $     $ 0.1     $     $ 0.1  
Financial Liabilities:
                               
Interest rate contract(1)
  $     $ 7.4     $     $ 7.4  
Foreign currency contracts(2)
  $     $ 0.4     $     $ 0.4  
 
(1)   The fair value of the interest rate contract is determined using a mark-to-market valuation technique based on an observable interest rate yield curve and adjusting for credit risk.
 
(2)   The fair value of the foreign currency contracts are determined using a mark-to-market technique based on observable foreign currency exchange rates and adjusting for credit risk.