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Stock-Based Compensation (Details) (USD $)
 3 Months Ended 6 Months Ended
Apr. 30, 2012
Jul. 31, 2012
Summary of activity under Option and Stock Plans    
Outstanding, January 31, 2012, Shares 817,000 817,000
Outstanding, January 31, 2012, Weighted Average Exercise Price $ 12.10 $ 12.10
Outstanding, January 31, 2012, Weighted Average Remaining Contract Term 4 years 11 months 9 days 5 years 15 days
Outstanding, January 31, 2012, Weighted Average Fair Value, Outstanding $ 5.68 $ 5.68
Granted, Shares   173,000
Granted, Weighted Average Exercise Price   $ 16.32
Forfeited, Shares   (30,000)
Forfeited, Weighted Average Exercise Price   $ 8.66
Exercised, Shares   (17,000)
Exercised, Weighted Average Exercise Price   $ 6.70
Outstanding, July 31, 2012, Shares   943,000
Outstanding, July 31, 2012, Weighted Average Exercise Price   $ 13.08
Outstanding, July 31, 2012, Weighted Average Remaining Contract Term 4 years 11 months 9 days 5 years 15 days
Outstanding, July 31, 2012, Weighted Average Fair Value   $ 5.68
Exercisable, July 31, 2012, Shares   650,000
Exercisable, July 31, 2012, Weighted Average Exercise Price   $ 11.44
Exercisable, July 31, 2012, Weighted Average Remaining Contract Term 4 years 10 months 21 days 4 years 6 months 15 days
Exercisable, July 31, 2012, Weighted Average Fair Value   $ 5.76
Exercisable, January 31, 2012, Shares 605,000 605,000
Exercisable, January 31, 2012, Weighted Average Exercise Price $ 11.47 $ 11.47
Exercisable, January 31, 2012, Weighted Average Remaining Contract Term 4 years 10 months 21 days 4 years 6 months 15 days
Exercisable, January 31, 2012, Weighted Average Fair Value $ 5.89 $ 5.89