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Net Income Per Common Share Net Loss per Common Share (Narrative) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
0 Months Ended 3 Months Ended 6 Months Ended
Apr. 10, 2013
Mar. 26, 2013
Mar. 04, 2013
Mar. 06, 2012
Jun. 08, 2011
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2013
Jan. 31, 2012
Anti-dilutive securities (in shares)           0 0 842,000 666,000
Estimated annual dividend amount (in dollars per share)         $ 0.60     $ 0.75  
Increase to annual cash dividend rate     10.00% 25.00%          
Cash dividends declared per share     $ 0.2075     $ 0.1875 $ 0.15 $ 0.3750 $ 0.30
Dividends Payable, Date to be Paid Apr. 09, 2013                
Payments of Dividends           $ (6,700) $ (5,400) $ 13,458 $ 10,801
Dividends Payable, Date of Record   Mar. 25, 2013