Quarterly report pursuant to Section 13 or 15(d)

Severance and Other Restructuring Costs - Activity in Accrued Restructuring Liability (Detail)

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Severance and Other Restructuring Costs - Activity in Accrued Restructuring Liability (Detail)
$ in Thousands
 3 Months Ended
Apr. 30, 2018
USD ($)
Restructuring Cost and Reserve [Line Items]  
Accrual balance at the beginning of the period $ 225
Restructuring charges incurred (24)
Cash payments (203)
Accrual balance at the ending of the period (2)
Employee-Related Benefits [Member]  
Restructuring Cost and Reserve [Line Items]  
Accrual balance at the beginning of the period 61
Restructuring charges incurred 12
Cash payments (73)
Closure of Leased Facilities [Member]  
Restructuring Cost and Reserve [Line Items]  
Accrual balance at the beginning of the period 135
Restructuring charges incurred (7)
Cash payments (130)
Accrual balance at the ending of the period (2)
Other Restructuring [Member]  
Restructuring Cost and Reserve [Line Items]  
Accrual balance at the beginning of the period 29
Restructuring charges incurred $ (29)