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Balance Sheet Components - Schedule of Operating Lease Right-of-Use Assets, Net (Details) - USD ($) $ in Thousands | Apr. 30, 2020 | Jan. 31, 2020
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Balance Sheet Related Disclosures [Abstract] |  |
Operating lease right-of-use assets | $ 260,825 | $ 233,255
Less: accumulated amortization | (45,162) | (35,449)
Operating lease right-of-use assets, net | $ 215,663 | $ 197,806

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- Definition Operating lease right of use Asset, gross. + References No definition available. + Details
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Namespace Prefix: | box_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Operating lease right of use assets accumulated amortization. + References No definition available. + Details
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Namespace Prefix: | box_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_BalanceSheetRelatedDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant