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Income Taxes (Reconciliation Of Effective Income Tax Rate) (Details)
12 Months Ended
Jan. 31, 2012
Jan. 31, 2011
Jan. 31, 2010
Income Taxes [Abstract]      
Expected provision at statutory U.S. federal tax rate 35.00% 35.00% 35.00%
State and local income taxes, net of federal tax benefit 3.20% 3.20% 2.30%
Foreign taxes (2.10%) (2.10%) (0.60%)
Federal rehabilitation tax credits   (0.80%)  
Other (0.20%) (0.70%) (0.50%)
Effective tax rate 35.90% 34.60% 36.20%