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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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