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Income Taxes - Additional Information (Detail) - USD ($)
 12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Income Tax Disclosure [Abstract]      
Effective federal income tax rate 21.00% 32.90% 34.00%
Decrease in deferred income tax assets   $ 7,000,000  
Repatriation of foreign earnings   11,200,000  
Deferred tax assets, assets held for sale $ 1,500,000    
Deferred tax assets, stock based compensation 781,000 1,381,000  
Valuation allowance, deferred tax assets 21,407,000 21,154,000  
Tax credit carry forwards $ 675,000    
Tax credit carry forwards expiration year 2021    
Unrecognized tax benefits $ 0 0 $ 0
Excess tax deficiency for share-based payments under ASU 2016-09 $ 663,000 $ 309,000 $ 0