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Common Stock Repurchases (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2011
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract]            
Options Exercised 322,520 20,000 40,000 180,000 548,334 177,500
Exercise Price $ 10.74 $ 9.00 $ 9.00 $ 9.48 $ 11.02 $ 8.47
Shares Net Settled for Exercise 131,298 7,506 16,082 76,396 295,496 76,050
Shares Withheld for Taxes (1) 85,684 [1] 4,584 [1] 8,974 [1] 48,366 [1] 118,032 [1] 37,834 [1]
Net Shares to Employee 105,538 7,910 14,944 55,238 134,806 63,616
Share Price for Withholding $ 26.38 $ 23.98 $ 22.39 $ 22.33 $ 20.40 $ 19.76
Tax Withholding (in 000's) $ 2,260 $ 110 $ 201 $ 1,080 $ 2,408 $ 748
[1] Shares withheld for taxes are treated as a repurchase of shares for accounting purposes but do not count against our stock repurchase program.