Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Components of the Change in Pension Benefit Obligation (Detail)

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Employee Benefit Plans - Components of the Change in Pension Benefit Obligation (Detail) - USD ($)
12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract]      
Projected benefit obligation, beginning of fiscal year $ 530,000 $ 1,063,000  
Service cost   238,000 $ 288,000
Interest cost   54,000 51,000
Actuarial gain   (801,000) (435,000)
Foreign currency exchange rate changes   (24,000)  
Termination of the Plan (530,000)    
Projected benefit obligation, end of fiscal year $ 0 530,000 $ 1,063,000
Funded status at end of fiscal year   $ 530,000