Balance Sheet Components - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Balance Sheet Components Disclosure [Abstract]
Depreciation and amortization	$ 13,200	$ 8,500	$ 34,900	$ 22,100
Intangible assets amortization expense	$ 376	$ 326	$ 1,000	$ 978