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Summary of Significant Accounting Policies - Additional Information (Details)			12 Months Ended
	Jan. 31, 2016 USD ($) Customer shares	Jan. 31, 2015 USD ($) Customer shares	Jan. 31, 2016 USD ($) Source Customer shares	Jan. 31, 2015 USD ($) Customer shares	Jan. 31, 2014 USD ($) Customer
Concentration Risk [Line Items]
Number of revenue sources | Source			3
Deferred sales commissions costs			$ 21,700,000	$ 16,200,000	$ 14,000,000
Amortization of deferred commissions			$ 15,816,000	12,079,000	13,500,000
Cash and cash equivalents liquid investments original maturity period			90 days
Restricted cash	$ 27,952,000	$ 3,367,000	$ 27,952,000	3,367,000
Marketable securities	$ 7,379,000	$ 0	7,379,000	0	0
Goodwill impairment			0
Costs incurred during the application development stage			0
Advertising costs			$ 28,500,000	28,600,000	25,000,000
Remeasurement of redeemable convertible preferred stock warrant liability				$ (126,000)	$ 8,477,000
Preferred stock, shares outstanding | shares	0	0	0	0
Measured tax percentage of likelihood realized upon settlement			50.00%
Redeemable Convertible Preferred Stock
Concentration Risk [Line Items]
Preferred stock, shares outstanding | shares	0	0	0	0
Minimum
Concentration Risk [Line Items]
Property and equipment, estimated useful lives			2 years
Finite-lived intangible assets estimated useful lives			2 years
Maximum
Concentration Risk [Line Items]
Property and equipment, estimated useful lives			3 years
Finite-lived intangible assets estimated useful lives			7 years
Credit Concentration Risk | Accounts Receivable
Concentration Risk [Line Items]
Number of major customer | Customer	0	0	0	0
Concentration risk percentage	10.00%	10.00%
Customer Concentration Risk | Revenue
Concentration Risk [Line Items]
Number of major customer | Customer	0	0	0	0	0
Concentration risk percentage			10.00%	10.00%	10.00%
Geographic Concentration Risk | Revenue | United States
Concentration Risk [Line Items]
Concentration risk percentage			82.00%	79.00%	80.00%
Geographic Concentration Risk | Property and Equipment | United States
Concentration Risk [Line Items]
Concentration risk percentage	99.00%	98.00%

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