Summary of Level 3 Activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 3,749	$ 4,563
Payments	(1,475)	(1,525)
Adjustments		586
Interest accretion	111	125
Balance at ending of period	$ 2,385	$ 3,749