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Leases - Summary of Maturities of Operating and Finance Lease Liabilities (Parenthetical) (Details) $ in Millions	Jan. 31, 2026 USD ($)
Leases [Abstract]
Non-cancellable sublease proceeds for the year ending January 31, 2027	$ 4.9
Non-cancellable sublease proceeds for the year ending January 31, 2028	5.1
Non-cancellable sublease proceeds for the year ending January 31, 2029	$ 1.8

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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

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Namespace Prefix:	box_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration