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Reconciliation of Statutory Federal Income Tax Rate to Effective Rate Reported in Financial Statements (Detail)
 12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Income Tax Disclosure [Abstract]      
Provision for Federal income taxes at the statutory rate 35.00% 35.00% 35.00%
State and local income taxes, net of Federal tax benefit 3.00% 3.30% 3.30%
Permanent differences resulting in Federal taxable income 4.50% 4.80% 5.50%
Foreign tax rate differential (0.10%) (1.40%) (3.40%)
Foreign tax credit (5.40%) (2.50%) (2.50%)
Other, net 0.50% (0.70%) (0.50%)
Actual provision for income taxes 37.50% 38.50% 37.40%