Lessee, Operating Lease, Lease Not Yet Commenced, Undiscounted Cash Flows

No definition available.

Name:	pstg_LesseeOperatingLeaseLeaseNotYetCommencedUndiscountedCashFlows
Namespace Prefix:	pstg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Operating Lease, Additional Obligation

+ References

No definition available.

+ Details

Name:	pstg_OperatingLeaseAdditionalObligation
Namespace Prefix:	pstg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=pstg_OfficeFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=pstg_DataCenterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
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- Details

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Leases - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Leases - Narrative (Details) - USD ($) $ in Millions	Feb. 02, 2020	Jan. 31, 2019	Jan. 31, 2018
Lessee, Lease, Description [Line Items]
Rent expense recognized under operating leases		$ 25.6	$ 19.4
Undiscounted cash flows of leases that have not yet commenced	$ 30.3
Office Facility
Lessee, Lease, Description [Line Items]
Additional lease obligation	19.4
Data Center
Lessee, Lease, Description [Line Items]
Additional lease obligation	$ 22.4
Minimum
Lessee, Lease, Description [Line Items]
Term of contract for leases that have not yet commenced	5 years
Maximum
Lessee, Lease, Description [Line Items]
Term of contract for leases that have not yet commenced	12 years