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, unless otherwise specified
3 Months Ended 9 Months Ended
Oct. 31, 2013
Oct. 31, 2013
Restructuring And Related Activities [Abstract]    
Accrual balance at the beginning of the period $ 601 $ 330
Severance charges accrued 80 908
Severance costs paid (339) (896)
Accrual balance as of October 31, 2013 $ 342 $ 342