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Leases - Summary of Maturities of Operating and Finance Lease Liabilities (Parenthetical) (Details) $ in Millions | Oct. 31, 2025 USD ($)
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Leases [Abstract] |
Non-cancellable sublease proceeds for the remainder of the year ending January 31, 2026 | $ 0.6
Non-cancellable sublease proceeds for the year ending January 31, 2027 | 2.7
Non-cancellable sublease proceeds for the year ending January 31, 2028 | 2.2
Non-cancellable sublease proceeds for the year ending January 31, 2029 | $ 0.5

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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
Balance Type: | debit
Period Type: | instant

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

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- Definition Operating leases future minimum payments sublease rentals proceeds due remainder of fiscal year. + References No definition available. + Details
Name: | box_OperatingLeasesFutureMinimumPaymentsSubleaseRentalsProceedsDueRemainderOfFiscalPeriod
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