Fair Value Measurements (Details 1) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 3 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2013
Fair Value, Inputs, Level 3 [Member]
Jan. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Apr. 30, 2013
Accrued Contingent Consideration [Member]
Fair Value, Inputs, Level 3 [Member]
Ending balance January 31, 2013 $ 5,656 [1]   $ 2,388 [1] $ 5,656 [1] $ 5,656
Change in fair value of contingent consideration 20 60     20
Contingency payments         (3,206)
Translation adjustment         (82)
Ending balance April 30, 2013 $ 2,388 [1]   $ 2,388 [1] $ 5,656 [1] $ 2,388
[1] 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.