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
Apr. 30, 2014
Restructuring And Related Activities [Abstract]  
Accrual balance at the beginning of the period $ 229
Severance charges accrued 474
Severance costs paid (482)
Accrual balance as of April 30, 2014 $ 221