Information about Geographic Areas - Revenues by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Revenues by geography
Total revenues	$ 142,779	$ 106,921	$ 393,890	$ 294,951
North America [Member]
Revenues by geography
Total revenues	78,144	59,344	215,123	162,915
Europe and other [Member]
Revenues by geography
Total revenues	41,740	29,003	115,674	79,561
Asia Pacific [Member]
Revenues by geography
Total revenues	$ 22,895	$ 18,574	$ 63,093	$ 52,475