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Common Stock Repurchases (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Oct. 31, 2013
Jan. 31, 2013
Share-Based Compensation Arrangement By Share-Based Payment Award, Options Exercisable [Abstract]    
Options Exercised 14,000 73,228
Exercise Price $ 16.43 $ 8.89
Shares Net Settled for Exercise 7,241 18,127
Shares Withheld for Taxes 2,519 [1] 17,461 [1]
Net Shares to Employee 4,240 37,640
Share Price for Withholding $ 31.77 $ 35.91
Tax Withholding (in 000's) $ 80 $ 627
[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.