Information about Geographic Areas - Revenues by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Revenues by geography
Total revenues	$ 195,547	$ 159,772	[1]
North America [Member]
Revenues by geography
Total revenues	109,277	86,901
Europe and other [Member]
Revenues by geography
Total revenues	56,982	48,398
Asia Pacific [Member]
Revenues by geography
Total revenues	$ 29,288	$ 24,473

[1] See note 1 of the notes to the condensed consolidated financial statements for a summary of adjustments.