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Condensed Consolidated Statement Of Shareholders' Equity (Parenthetical) (USD $)
3 Months Ended 6 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2012
Apr. 30, 2011
Condensed Consolidated Statement Of Shareholders' Equity [Abstract]        
Cash dividends declared per common share $ 0.015 $ 0.01 $ 0.03 $ 0.02