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Leases - Summary of Maturities of Operating and Finance Lease Liabilities (Parenthetical) (Details) $ in Millions	Apr. 30, 2020 USD ($)
Leases [Abstract]
Non-cancellable sublease proceeds for the year ending January 31, 2021	$ 6.7
Non-cancellable sublease proceeds for the year ending January 31, 2022	9.1
Non-cancellable sublease proceeds for the year ending January 31, 2023	8.3
Non-cancellable sublease proceeds for the year ending January 31, 2024	2.2
Non-cancellable sublease proceeds for the year ending January 31, 2025	$ 2.2

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- Definition

Operating leases future minimum payments sublease rentals proceeds due in year five.

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No definition available.

+ Details

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- Definition

Operating leases future minimum payments sublease rentals proceeds due in year four.

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No definition available.

+ Details

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- Definition

Operating leases future minimum payments sublease rentals proceeds due in year three.

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No definition available.

+ Details

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Namespace Prefix:	box_
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- Definition

Operating leases future minimum payments sublease rentals proceeds due in year two.

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No definition available.

+ Details

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- Definition

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

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No definition available.

+ Details

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Namespace Prefix:	box_
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- References

No definition available.

+ Details

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