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Income Taxes (Details)	3 Months Ended		9 Months Ended
Income Taxes (Details)	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2011	Oct. 31, 2010
Income Taxes [Abstract]
Effective tax rate	29.10%	30.00%	27.70%	29.30%
Federal statutory rate	35.00%	35.00%	35.00%	35.00%

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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