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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 | $ 27,000,000 us-gaap_LettersOfCreditOutstandingAmount |  |  | $ 27,000,000 us-gaap_LettersOfCreditOutstandingAmount |
Letters of credit, maturity date | Dec. 01, 2018 |  |  |  |
Capital lease term | 3 years |  |  |  |
Non-cancellable sublease payments | 12,600,000 us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals |  |  |  |
Contingent rent payments | 5,500,000 us-gaap_OperatingLeasesRentExpenseContingentRentals |  |  |  |
Rent expense | 3,700,000 us-gaap_LeaseAndRentalExpense | 1,400,000 us-gaap_LeaseAndRentalExpense |  |  |
Sublease income | 246,000 us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue | 437,000 us-gaap_OperatingLeasesIncomeStatementSubleaseRevenue |  |  |
Asset retirement obligations | 138,000 us-gaap_AssetRetirementObligationsNoncurrent |  |  | 135,000 us-gaap_AssetRetirementObligationsNoncurrent |
Amortization expenses | 1,100,000 us-gaap_AmortizationOfIntangibleAssets | 695,000 us-gaap_AmortizationOfIntangibleAssets |  |  |
Open Text S.A. |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |
Damage awarded |  |  | 4,900,000 us-gaap_LossContingencyDamagesAwardedValue / dei_LegalEntityAxis = box_OpenTextCorporationSanFranciscoMember |  |
Accrual for settlement payable |  |  |  | 4,900,000 us-gaap_LossContingencyAccrualAtCarryingValue / dei_LegalEntityAxis = box_OpenTextCorporationSanFranciscoMember |
Litigation settlement expense |  |  |  | 3,900,000 us-gaap_LitigationSettlementExpense / dei_LegalEntityAxis = box_OpenTextCorporationSanFranciscoMember |
Estimated useful life | 14 months |  |  |  |
Amortization expenses | 186,000 us-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 | $ 27,000,000 us-gaap_SecuritiesHeldAsCollateralAtFairValue / us-gaap_FinancialInstrumentAxis = us-gaap_SecuritiesPledgedAsCollateralMember |  |  | $ 2,000,000 us-gaap_SecuritiesHeldAsCollateralAtFairValue / us-gaap_FinancialInstrumentAxis = us-gaap_SecuritiesPledgedAsCollateralMember |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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