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Net Income (Loss) Per Common Share (Narrative) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended 6 Months Ended 0 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2012
Jan. 31, 2011
Mar. 26, 2012
Apr. 10, 2012
Jul. 31, 2012
Jan. 31, 2012
Parent Company [Member]
Jun. 07, 2011
Estimated [Member]
Anti-dilutive securities 38,000 87,000 666,000 36,000          
Cash dividends declared per share $ 0.15   $ 0.30           $ 0.60
Cash dividends estimated per share $ 0.15   $ 0.30            
Cash dividends paid on common stock $ 5,400   $ 10,801         $ 10,801  
Declaration date of increase to common stock cash dividends             Mar. 05, 2012    
Percent increase of common stock cash dividend declared             25.00%    
Quarterly cash dividend payable per share           $ 0.1875      
Dividend payable date           Apr. 10, 2012      
Dividend payable record date         Mar. 26, 2012