Quarterly report pursuant to Section 13 or 15(d)

Severance and Other Restructuring Costs - Change in Severance Liability (Detail)

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Severance and Other Restructuring Costs - Change in Severance Liability (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2015
Jul. 31, 2014
Restructuring and Related Activities [Abstract]        
Accrual balance at the beginning of the period $ 131   $ 2,021  
Severance and other restructuring charges incurred 617 $ 218 829 $ 692
Severance costs paid (458)   (2,495)  
Other adjustments (22)   (87)  
Accrual balance at the ending of the period $ 268   $ 268