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Common Stock Repurchases - Summary of common stock repurchase excercises (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Jan. 31, 2013
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract]        
Options Exercised 73,228 322,520 20,000 40,000
Exercise Price $ 8.89 $ 10.74 $ 9.00 $ 9.00
Shares Net Settled for Exercise 18,127 131,299 7,506 16,082
Shares Withheld for Taxes 17,461 [1] 85,683 [1] 4,584 [1] 8,974 [1]
Net Shares to Employee 37,640 105,538 7,910 14,944
Share Price for Withholding $ 35.91 $ 26.38 $ 23.98 $ 22.39
Tax Withholding (in 000's) $ 627 $ 2,260 $ 110 $ 201
[1] Shares withheld for taxes are treated as a repurchase of shares for accounting purposes but do not count against the Company's stock repurchase program.