Fair Value Measurement Summary of Level 3 Activity (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 6,016	$ 6,120
New contingent consideration	540	1,208
Payments	(1,266)	(1,504)
Adjustments	(898)	(42)
Interest accretion	179	234
Balance at end of period	$ 4,571	$ 6,016