Financial Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Oct. 31, 2016	Jan. 31, 2016
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis
Business Combination, Contingent Consideration, Liability, Current	$ 965	$ 1,460
Business Combination, Contingent Consideration, Liability, Noncurrent	1,492	2,289
Contingent consideration	2,457	3,749
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	$ 2,457	$ 3,749