Quarterly report pursuant to Section 13 or 15(d)

Severance and Other Restructuring Costs - Restructuring and Related Activities (Detail)

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Severance and Other Restructuring Costs - Restructuring and Related Activities (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jul. 31, 2013
Jul. 31, 2013
Restructuring And Related Activities [Abstract]    
Accrual balance at the beginning of the period $ 133 $ 330
Severance charges accrued 617 828
Severance costs paid (149) (557)
Accrual balance as of July 31, 2013 $ 601 $ 601