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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Apr. 30, 2015
Apr. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (47,283)us-gaap_NetIncomeLoss $ (38,511)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 9,166us-gaap_DepreciationAndAmortization 5,896us-gaap_DepreciationAndAmortization
Stock-based compensation expense 12,715us-gaap_ShareBasedCompensation 5,752us-gaap_ShareBasedCompensation
Amortization of deferred commissions 3,606us-gaap_AmortizationOfDeferredSalesCommissions 2,858us-gaap_AmortizationOfDeferredSalesCommissions
Remeasurement of redeemable convertible preferred stock warrant liability   267us-gaap_FairValueAdjustmentOfWarrants
Other (2)us-gaap_OtherNoncashIncomeExpense 157us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities, net of effects of acquisitions:    
Accounts receivable 15,623us-gaap_IncreaseDecreaseInAccountsReceivable 10,586us-gaap_IncreaseDecreaseInAccountsReceivable
Deferred commissions (2,813)box_IncreaseDecreaseInDeferredCommissions (2,789)box_IncreaseDecreaseInDeferredCommissions
Prepaid expenses, restricted cash and other assets (28,455)box_IncreaseDecreaseInPrepaidExpensesAndRestrictedCashAndOtherAssets (2,283)box_IncreaseDecreaseInPrepaidExpensesAndRestrictedCashAndOtherAssets
Accounts payable 266us-gaap_IncreaseDecreaseInAccountsPayable 1,314us-gaap_IncreaseDecreaseInAccountsPayable
Accrued expenses and other liabilities (997)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities (6,288)us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities
Deferred rent 1,848box_IncreaseDecreaseInDeferredRent 695box_IncreaseDecreaseInDeferredRent
Deferred revenue 4,144us-gaap_IncreaseDecreaseInDeferredRevenue (1,122)us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash used in operating activities (32,182)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (23,468)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of marketable securities (106,319)us-gaap_PaymentsToAcquireAvailableForSaleSecurities  
Sales of marketable securities 3,140us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities  
Purchases of property and equipment (9,901)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (5,961)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Acquisitions and purchases of intangible assets, net of cash acquired (200)box_PaymentsToAcquireBusinessesAndPurchasesOfIntangibleAssetsNetOfCashAcquired  
Net cash used in investing activities (113,280)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (5,961)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
CASH FLOWS FROM FINANCING ACTIVITIES:    
Payment of initial public offering costs (1,333)box_PaymentOfInitialPublicOfferingIssuanceCosts (1,735)box_PaymentOfInitialPublicOfferingIssuanceCosts
Proceeds from exercise of stock options, net of repurchases of early exercised stock options 796us-gaap_ProceedsFromStockOptionsExercised 1,577us-gaap_ProceedsFromStockOptionsExercised
Employee payroll taxes paid related to net share settlement of restricted stock units (4,215)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation  
Payments of capital lease obligations (228)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations  
Net cash used in financing activities (4,980)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (158)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Effect of exchange rate changes on cash and cash equivalents (7)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations 2us-gaap_EffectOfExchangeRateOnCashAndCashEquivalentsContinuingOperations
Net decrease in cash and cash equivalents (150,449)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (29,585)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of period 330,436us-gaap_CashAndCashEquivalentsAtCarryingValue 108,851us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of period 179,987us-gaap_CashAndCashEquivalentsAtCarryingValue 79,266us-gaap_CashAndCashEquivalentsAtCarryingValue
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Cash paid for interest 359us-gaap_InterestPaid 206us-gaap_InterestPaid
Cash paid for income taxes 458us-gaap_IncomeTaxesPaid 124us-gaap_IncomeTaxesPaid
SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES:    
Change in accrued equipment purchases (2,798)box_ChangeInAccruedEquipmentPurchases 9,533box_ChangeInAccruedEquipmentPurchases
Purchases of property and equipment under capital lease 1,730us-gaap_CapitalLeaseObligationsIncurred  
Issuance of common stock in connection with acquisitions and purchases of intangible assets 664box_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationSharesIssuedValue  
Vesting of early exercised stock options and restricted stock 40box_EarlyVestingOfExercisedStockOptionsAndRestrictedStock 240box_EarlyVestingOfExercisedStockOptionsAndRestrictedStock
Change in unpaid deferred offering costs $ (1,333)box_ChangeInUnpaidDeferredOfferingCosts $ (411)box_ChangeInUnpaidDeferredOfferingCosts