Balance Sheet Components - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Balance Sheet Components Disclosure [Abstract]
Depreciation and amortization	$ 8,500,000	$ 4,100,000	$ 22,100,000	$ 9,200,000
Intangible assets amortization expense	$ 326,000	$ 306,000	$ 978,000	$ 515,000