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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Income Tax Disclosure [Abstract]        
Effective tax rate for income from continuing operation 36.00% 34.50% 32.70%  
Foreign tax credit carryforwards $ 508,000 $ 426,000    
Tax credit carryforward expiration period Between fiscal years ended 2024 to 2027.      
Valuation allowance $ 679,000 583,000    
Increase (decrease) in valuation allowance 100,000 300,000    
Recognized tax benefits excluding interest and penalties 708,000 591,000 $ 707,000 $ 715,000
Impact on effective tax rate, decrease 500,000      
Recognized (benefit) expense related to interest and penalties 52,000 (87,000) $ 43,000  
Accrued potential interest and penalties 400,000 $ 400,000    
Undistributed earnings of foreign subsidiaries $ 4,700,000