Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

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Fair Value Measurements (Details) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2012
Financial assets:  
Money market accounts (a) $ 3,089 [1]
U.S. government agency issues (a) 12,788 [1]
Total assets 15,877
Other liabilities:  
Acquisition-related consideration (b) 6,707 [2]
Fair Value, Inputs, Level 1 [Member]
  
Financial assets:  
Money market accounts (a) 3,089 [1]
U.S. government agency issues (a) 12,788 [1]
Total assets 15,877
Other liabilities:  
Acquisition-related consideration (b) 0 [2]
Fair Value, Inputs, Level 2 [Member]
  
Financial assets:  
Money market accounts (a) 0 [1]
U.S. government agency issues (a) 0 [1]
Total assets 0
Other liabilities:  
Acquisition-related consideration (b) 0 [2]
Fair Value, Inputs, Level 3 [Member]
  
Financial assets:  
Money market accounts (a) 0 [1]
U.S. government agency issues (a) 0 [1]
Total assets 0
Other liabilities:  
Acquisition-related consideration (b) $ 6,707 [2]
[1] Money market funds and U.S. government agency securities, included in cash and cash equivalents in the accompanying balance sheet, are valued at quoted market prices for identical instruments in active markets.
[2] The fair value of our contingent consideration arrangement is determined based on our evaluation as to the probability and amount of any earn-out that will be achieved based on expected future performance by the acquired entity, as well as the fair value of fixed purchase price.