Financial Liabilities Measured at Fair Value on a Recurring Basis (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Jul. 31, 2015	Jan. 31, 2015
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis
Contingent consideration	$ 3,008	$ 4,563
Level 1
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis
Contingent consideration	0	0
Level 2
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis
Contingent consideration	0	0
Level 3
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis
Contingent consideration	$ 3,008	$ 4,563