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Net Loss per Share Attributable to Common Stockholders - Summary of Computation of Basic and Diluted Net Loss Per Share (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Numerator:    
Net loss $ (47,283)us-gaap_NetIncomeLoss $ (38,511)us-gaap_NetIncomeLoss
Add: accretion of redeemable convertible preferred stock   (43)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment
Net loss attributable to common stockholders (47,283)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (38,554)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator:    
Weighted-average number of shares outstanding—basic and diluted 119,379us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 13,734us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Net loss per share attributable to common stockholders—basic and diluted $ (0.40)us-gaap_EarningsPerShareBasicAndDiluted $ (2.81)us-gaap_EarningsPerShareBasicAndDiluted
Class A Common Stock    
Numerator:    
Net loss (6,031)us-gaap_NetIncomeLoss
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Net loss attributable to common stockholders (6,031)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Denominator:    
Weighted-average number of shares outstanding—basic and diluted 15,226us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Net loss per share attributable to common stockholders—basic and diluted $ (0.40)us-gaap_EarningsPerShareBasicAndDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
 
Class B Common Stock    
Numerator:    
Net loss (41,252)us-gaap_NetIncomeLoss
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
(38,511)us-gaap_NetIncomeLoss
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Add: accretion of redeemable convertible preferred stock   (43)us-gaap_TemporaryEquityAccretionToRedemptionValueAdjustment
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Net loss attributable to common stockholders $ (41,252)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ (38,554)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Denominator:    
Weighted-average number of shares outstanding—basic and diluted 104,153us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
13,734us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Net loss per share attributable to common stockholders—basic and diluted $ (0.40)us-gaap_EarningsPerShareBasicAndDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ (2.81)us-gaap_EarningsPerShareBasicAndDiluted
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember