Annual report pursuant to Section 13 and 15(d)

Investments in Marketable Securities (Details)

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Investments in Marketable Securities (Details)
In Thousands, unless otherwise specified
Jan. 31, 2013
USD ($)
Sep. 01, 2012
USD ($)
Sep. 01, 2012
EUR (€)
Jan. 31, 2012
USD ($)
Sep. 01, 2009
USD ($)
Sep. 01, 2009
EUR (€)
Jan. 31, 2013
Fair Value, Inputs, Level 1 [Member]
USD ($)
Jan. 31, 2012
Fair Value, Inputs, Level 1 [Member]
USD ($)
Jan. 31, 2013
Fair Value, Inputs, Level 2 [Member]
USD ($)
Jan. 31, 2012
Fair Value, Inputs, Level 2 [Member]
USD ($)
Jan. 31, 2013
Fair Value, Inputs, Level 3 [Member]
USD ($)
Jan. 31, 2012
Fair Value, Inputs, Level 3 [Member]
USD ($)
Financial assets:                        
Cash $ 104,109     $ 74,226     $ 104,109 $ 74,226 $ 0 $ 0 $ 0 $ 0
Money market accounts 2,612 [1]     6,359 [1]     2,612 [1] 6,359 [1] 0 [1] 0 [1] 0 [1] 0 [1]
Available for sale marketable securities:                        
U.S. government agency issues - Current 6,104     7,855     6,104 7,855 0 0 0 0
Non-current marketable securities:                        
U.S. government agency issues - Non current 7,169     4,140     7,169 4,140 0 0 0 0
Total 119,994     92,580     119,994 92,580 0 0 0 0
Other liabilities:                        
Acquisition-related consideration $ 5,656 [2] $ 2,200 [2] € 1,700 [2] $ 12,255 [2] $ 1,000 [2] € 800 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 0 [2] $ 5,656 [2] $ 12,255 [2]
[1] Money market funds and U.S. government agency securities, included in cash and cash equivalents on the accompanying consolidated 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.