Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans - Components of Net Periodic Benefit Cost of the Pension Plan (Detail)

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Employee Benefit Plans - Components of Net Periodic Benefit Cost of the Pension Plan (Detail) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]      
Service cost $ 238 $ 288 $ 176
Interest cost 54 51 39
Actuarial (gain) loss (801) (435) 379
Net periodic benefit cost $ (509) $ (96) $ 594