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Net Income Per Common Share (Reconciliation Of Weighted Average Shares Outstanding Used For Computation Of Basic And Diluted Net Income Per Common Share) (Details)	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Net Income Per Common Share [Abstract]
Basic weighted average shares outstanding	154,025,589	166,896,322	168,053,502
Effect of dilutive options, non-vested shares and stock appreciation rights	2,165,700	3,437,228	3,176,743
Diluted weighted average common shares outstanding	156,191,289	170,333,550	171,230,245

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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