Condensed Consolidated Statement Of Shareholders' Equity (Unaudited) (Parenthetical) (USD $)
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3 Months Ended | 9 Months Ended | ||
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Oct. 31, 2012
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Oct. 31, 2011
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Oct. 31, 2012
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Oct. 31, 2011
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Statement of Stockholders' Equity [Abstract] | ||||
Dividends declared per common share | $ 0.00 | $ 0.00 | $ 1.59 | $ 1.46 |