Financial Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jan. 31, 2016	Jan. 31, 2015
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis
Contingent consideration	$ 3,749	$ 4,563
Level 1 | Fair Value, Measurements, Recurring
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis
Contingent consideration	0	0
Level 2 | Fair Value, Measurements, Recurring
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis
Contingent consideration	0	0
Level 3 | Fair Value, Measurements, Recurring
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis
Contingent consideration	$ 3,749	$ 4,563