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Net Income Per Common Share Net Loss per Common Share (Narrative) (Details) (USD $)
In Thousands, except Share data in Millions, unless otherwise specified
0 Months Ended 3 Months Ended
Nov. 30, 2012
Jun. 08, 2012
Mar. 06, 2012
Oct. 31, 2012
Oct. 31, 2011
Anti-dilutive securities (in shares)       1.4 1.5
Estimated annual dividend amount (in dollars per share)   $ 0.60   $ 0.75  
Increase to annual cash dividend rate     25.00%    
Cash dividends declared per share $ 0.1875     $ 0.1875 $ 0.15
Payments of Dividends       $ 6,729 $ 5,429