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Commitments and Contingencies - Additional Information (Details) (USD $)
3 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Feb. 13, 2015
Jan. 31, 2015
Mar. 31, 2015
Commitments And Contingencies [Line Items]          
Letters of credit facility $ 27,000,000us-gaap_LettersOfCreditOutstandingAmount     $ 27,000,000us-gaap_LettersOfCreditOutstandingAmount  
Letters of credit, maturity date Dec. 01, 2018        
Capital lease term 3 years        
Non-cancellable sublease payments 12,600,000us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals        
Contingent rent payments 5,500,000us-gaap_OperatingLeasesRentExpenseContingentRentals        
Rent expense 3,700,000us-gaap_LeaseAndRentalExpense 1,400,000us-gaap_LeaseAndRentalExpense      
Sublease income 246,000us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue 437,000us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue      
Asset retirement obligations 138,000us-gaap_AssetRetirementObligationsNoncurrent     135,000us-gaap_AssetRetirementObligationsNoncurrent  
Amortization expenses 1,100,000us-gaap_AmortizationOfIntangibleAssets 695,000us-gaap_AmortizationOfIntangibleAssets      
Open Text S.A.          
Commitments And Contingencies [Line Items]          
Damage awarded     4,900,000us-gaap_LossContingencyDamagesAwardedValue
/ dei_LegalEntityAxis
= box_OpenTextCorporationSanFranciscoMember
   
Accrual for settlement payable       4,900,000us-gaap_LossContingencyAccrualAtCarryingValue
/ dei_LegalEntityAxis
= box_OpenTextCorporationSanFranciscoMember
 
Litigation settlement expense       3,900,000us-gaap_LitigationSettlementExpense
/ dei_LegalEntityAxis
= box_OpenTextCorporationSanFranciscoMember
 
Estimated useful life 14 months        
Amortization expenses 186,000us-gaap_AmortizationOfIntangibleAssets
/ dei_LegalEntityAxis
= box_OpenTextCorporationSanFranciscoMember
       
Subleases Expires in Fiscal 2018          
Commitments And Contingencies [Line Items]          
Term of sublease arrangement         18 months
Non-cancellable sublease expiration year 2018        
Subleases Expires in Fiscal 2019          
Commitments And Contingencies [Line Items]          
Term of sublease arrangement 36 months        
Non-cancellable sublease expiration year 2019        
Minimum          
Commitments And Contingencies [Line Items]          
Operating lease expiration year 2016        
Maximum          
Commitments And Contingencies [Line Items]          
Operating lease expiration year 2029        
Securities Pledged as Collateral          
Commitments And Contingencies [Line Items]          
Certificate of deposit held as collateral for letter of credit $ 27,000,000us-gaap_SecuritiesHeldAsCollateralAtFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_SecuritiesPledgedAsCollateralMember
    $ 2,000,000us-gaap_SecuritiesHeldAsCollateralAtFairValue
/ us-gaap_FinancialInstrumentAxis
= us-gaap_SecuritiesPledgedAsCollateralMember