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Differences Between the Statutory U.S. Federal Income Tax Rate and the Company's Effective Tax Rate (Detail)
12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Schedule of Effective Tax Rate Reconciliation [Line Items]      
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 3.10% 3.70% 3.70%
Foreign taxes (2.90%) (2.00%) (2.40%)
Federal rehabilitation tax credit (0.00%) (1.90%) (0.00%)
Other 0.30% 1.10% (0.30%)
Effective tax rate 35.50% 35.90% 36.00%