Information about Geographic Areas - Long-Lived Assets by Geographic Area (Detail) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Long-lived assets by geography
Total long-lived assets	$ 53,528	$ 49,907
North America [Member]
Long-lived assets by geography
Total long-lived assets	50,732	47,096
Europe and other [Member]
Long-lived assets by geography
Total long-lived assets	1,820	1,762
Asia Pacific [Member]
Long-lived assets by geography
Total long-lived assets	$ 976	$ 1,049