Reconciliation of Statutory Federal Income Tax Rate to Effective Rate Reported in Financial Statements (Detail)	12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011
Income Tax Rate Reconciliation [Line Items]
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	3.30%	3.30%	4.90%
Permanent differences resulting in Federal taxable income	4.80%	5.50%	0.40%
Foreign tax rate differential	(1.40%)	(3.40%)
Foreign tax credit	(2.50%)	(2.50%)
Other, net	(0.70%)	(0.50%)	(1.30%)
Actual provision for income taxes	38.50%	37.40%	39.00%