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Summary of Level 3 Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 31, 2016
Jan. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period $ 4,563 $ 4,571
New contingent consideration 0 1,450
Payments (1,525) (1,589)
Adjustments 586 (11)
Interest accretion 125 142
Balance at ending of period $ 3,749 $ 4,563