Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Additional Information (Detail)

v3.3.1.900
Employee Benefit Plans - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Jan. 31, 2014
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Interest costs $ 100 $ 39  
Service cost 300 200  
Actuarial gain (loss) 400 (400)  
Unfunded projected benefit obligation 1,100 $ 1,200  
Benefit payments related to plan $ 200    
Benefit obligation, projected discount rate 5.08% 4.20%  
Periodic benefit costs, projected discount rate 0.00% 4.20%  
Benefit obligation, compensation increase rate 7.00% 7.00%  
Periodic benefit costs, compensation increase rate 7.00% 7.00%  
Periodic benefit costs $ 300 $ 200 $ 200
Retirement Savings Plan [Member]      
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Defined contribution plan, cost recognized $ 1,500 $ 1,700 $ 1,700