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Summary of Level 3 Activity (Detail)
$ in Thousands
9 Months Ended
Oct. 31, 2016
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]  
Balance at beginning of period $ 3,749
Payments (1,475)
Adjustment 99
Interest accretion 84
Balance at ending of period $ 2,457