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Balance Sheet Components - Schedule of Operating Lease Right-of-Use Assets, Net (Details) - USD ($) $ in Thousands	Apr. 30, 2020	Jan. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Operating lease right-of-use assets	$ 260,825	$ 233,255
Less: accumulated amortization	(45,162)	(35,449)
Operating lease right-of-use assets, net	$ 215,663	$ 197,806

X

- Definition

Operating lease right of use Asset, gross.

+ References

No definition available.

+ Details

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

X

- Definition

Operating lease right of use assets accumulated amortization.

+ References

No definition available.

+ Details

Name:	box_OperatingLeaseRightOfUseAssetsAccumulatedAmortization
Namespace Prefix:	box_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_BalanceSheetRelatedDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

Name:	us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant