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Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Oct. 31, 2019	Jan. 31, 2019
Minimum
Commitments And Contingencies [Line Items]
Purchase obligation, term	3 years
Maximum
Commitments And Contingencies [Line Items]
Purchase obligation, term	8 years
November 2017 Facility | Wells Fargo Bank | Secured Debt | Letters of Credit
Commitments And Contingencies [Line Items]
Letters of credit facility	$ 26.5	$ 26.5

X

- Definition

Commitments and contingencies.

+ References

No definition available.

+ Details

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Namespace Prefix:	box_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Term of the unrecognized unconditional purchase obligation, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308

+ Details

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Period Type:	duration

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- Details

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- Details

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- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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- Details

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X

- Details

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Period Type: