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Leases - Summary of Maturities of Operating and Finance Lease Liabilities (Parenthetical) (Details) $ in Millions | Jan. 31, 2021 USD ($)
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Leases [Abstract] |
Non-cancellable sublease proceeds for the year ending January 31, 2022 | $ 9.3
Non-cancellable sublease proceeds for the year ending January 31, 2023 | 8.8
Non-cancellable sublease proceeds for the year ending January 31, 2024 | 2.3
Non-cancellable sublease proceeds for the year ending January 31, 2025 | $ 2.1

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- Definition Operating leases future minimum payments sublease rentals proceeds due in next twelve months. + References No definition available. + Details
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Namespace Prefix: | box_
Data Type: | xbrli:monetaryItemType
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- Definition Operating leases future minimum payments sublease rentals proceeds due in year four. + References No definition available. + Details
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Namespace Prefix: | box_
Data Type: | xbrli:monetaryItemType
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- Definition Operating leases future minimum payments sublease rentals proceeds due in year three. + References No definition available. + Details
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Namespace Prefix: | box_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Operating leases future minimum payments sublease rentals proceeds due in year two. + References No definition available. + Details
Name: | box_OperatingLeasesFutureMinimumPaymentsSubleaseRentalsProceedsDueInYearTwo
Namespace Prefix: | box_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration