Quarterly report pursuant to Section 13 or 15(d)

Severance and Other Restructuring Costs - Additional Information (Detail)

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Severance and Other Restructuring Costs - Additional Information (Detail)
$ in Thousands
 3 Months Ended 6 Months Ended 24 Months Ended
Sep. 10, 2018
USD ($)
Jul. 31, 2018
USD ($)
Jul. 31, 2017
USD ($)
Jul. 31, 2018
USD ($)
Employee
Jul. 31, 2017
USD ($)
Jul. 31, 2018
USD ($)
Restructuring Cost and Reserve [Line Items]            
Severance and other restructuring costs   $ 536 $ 563 $ 590 $ 2,710  
Additional severance charges   $ 500   $ 700    
Number of employees terminated | Employee       12    
Severance costs     $ 200   $ 200  
Restructuring Plan [Member]            
Restructuring Cost and Reserve [Line Items]            
Total restructuring charges incurred           $ 7,100
Restructuring Plan [Member] | Subsequent Event [Member]            
Restructuring Cost and Reserve [Line Items]            
Annualized cost savings $ 6,000          
Severance and other restructuring costs $ 1,000