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, 2017
USD ($)
Restructuring Cost and Reserve [Line Items]  
Accrual balance at the beginning of the period $ 1,023
Restructuring charges incurred 2,139
Cash payments (2,671)
Other charges 5
Accrual balance at the ending of the period 496
Employee-Related Benefits [Member]  
Restructuring Cost and Reserve [Line Items]  
Accrual balance at the beginning of the period 785
Restructuring charges incurred 2,002
Cash payments (2,367)
Other charges 5
Accrual balance at the ending of the period 425
Closure of Leased Facilities [Member]  
Restructuring Cost and Reserve [Line Items]  
Accrual balance at the beginning of the period 130
Restructuring charges incurred 15
Cash payments (160)
Accrual balance at the ending of the period (15)
Other Restructuring [Member]  
Restructuring Cost and Reserve [Line Items]  
Accrual balance at the beginning of the period 108
Restructuring charges incurred 122
Cash payments (144)
Accrual balance at the ending of the period $ 86