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Reconciliation of Weighted Average Shares Outstanding Used for Computation of Basic and Diluted Net Income Per Common Share (Detail)	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Earnings Per Share [Line Items]
Basic weighted average shares outstanding	145,253,691	154,025,589	166,896,322
Effect of dilutive options, stock appreciation rights, restricted shares and performance stock units	1,410,040	2,165,700	3,437,228
Diluted weighted average shares outstanding	146,663,731	156,191,289	170,333,550

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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.

+ References

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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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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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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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