Leases - Summary of Maturities of Operating and Finance Lease Liabilities (Parenthetical) (Details) $ in Millions	Apr. 30, 2026 USD ($)
Leases [Abstract]
Non-cancellable sublease proceeds for the remainder of the year ending January 31, 2027	$ 4.2
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

Operating leases future minimum payments sublease rentals proceeds due remainder of fiscal year.

No definition available.

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