Leases - Summary of Maturities of Operating and Finance Lease Liabilities (Parenthetical) (Details) $ in Millions	Jan. 31, 2022 USD ($)
Leases [Abstract]
Non-cancellable sublease proceeds for the year ending January 31, 2023	$ 8.2
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

Operating leases future minimum payments sublease rentals proceeds due in next twelve months.

No definition available.

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