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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Jan. 31, 2015
Jan. 31, 2014
Current assets:    
Cash and cash equivalents $ 129,253us-gaap_CashAndCashEquivalentsAtCarryingValue $ 262,507us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments 268,620us-gaap_AvailableForSaleSecuritiesCurrent 25,625us-gaap_AvailableForSaleSecuritiesCurrent
Accounts receivable, net of allowance for doubtful accounts of $413 and $305, respectively 92,661us-gaap_AccountsReceivableNetCurrent 58,433us-gaap_AccountsReceivableNetCurrent
Deferred income taxes 4,815us-gaap_DeferredTaxAssetsNetCurrent 2,075us-gaap_DeferredTaxAssetsNetCurrent
Other current assets 6,488us-gaap_OtherAssetsCurrent 5,092us-gaap_OtherAssetsCurrent
Total current assets 501,837us-gaap_AssetsCurrent 353,732us-gaap_AssetsCurrent
Property and equipment, net 28,203us-gaap_PropertyPlantAndEquipmentNet 2,445us-gaap_PropertyPlantAndEquipmentNet
Capitalized internal-use software, net 1,240us-gaap_CapitalizedComputerSoftwareNet 1,585us-gaap_CapitalizedComputerSoftwareNet
Goodwill 4,850us-gaap_Goodwill 4,850us-gaap_Goodwill
Intangible assets, net 4,904us-gaap_FiniteLivedIntangibleAssetsNet 6,551us-gaap_FiniteLivedIntangibleAssetsNet
Other long-term assets 3,856us-gaap_OtherAssetsNoncurrent 1,145us-gaap_OtherAssetsNoncurrent
Total assets 544,890us-gaap_Assets 370,308us-gaap_Assets
Current liabilities:    
Accounts payable 3,886us-gaap_AccountsPayableCurrent 2,117us-gaap_AccountsPayableCurrent
Accrued compensation and benefits 6,497us-gaap_EmployeeRelatedLiabilitiesCurrent 8,750us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued expenses and other current liabilities 8,939us-gaap_AccruedLiabilitiesAndOtherLiabilities 7,931us-gaap_AccruedLiabilitiesAndOtherLiabilities
Income tax payable 3,241us-gaap_AccruedIncomeTaxesCurrent 439us-gaap_AccruedIncomeTaxesCurrent
Deferred revenue 112,960us-gaap_DeferredRevenueCurrent 67,380us-gaap_DeferredRevenueCurrent
Total current liabilities 135,523us-gaap_LiabilitiesCurrent 86,617us-gaap_LiabilitiesCurrent
Other long-term liabilities 2,534us-gaap_OtherLiabilitiesNoncurrent 3,595us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 138,057us-gaap_Liabilities 90,212us-gaap_Liabilities
Commitments and contingencies (Note 13)      
Stockholders’ equity:    
Additional paid-in capital 317,881us-gaap_AdditionalPaidInCapitalCommonStock 231,534us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated other comprehensive income 26us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 19us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained earnings 88,925us-gaap_RetainedEarningsAccumulatedDeficit 48,542us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders’ equity 406,833us-gaap_StockholdersEquity 280,096us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity 544,890us-gaap_LiabilitiesAndStockholdersEquity 370,308us-gaap_LiabilitiesAndStockholdersEquity
Class A common stock [Member]    
Stockholders’ equity:    
Common stock      
Class B common stock [Member]    
Stockholders’ equity:    
Common stock $ 1us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
$ 1us-gaap_CommonStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember