Business Combinations (Details) - USD ($)	1 Months Ended				12 Months Ended
	Oct. 31, 2020	Jun. 30, 2019	Apr. 30, 2019	Aug. 31, 2018	Jan. 31, 2021	Feb. 02, 2020	Jan. 31, 2019
Business Acquisition [Line Items]
Purchase consideration, net of cash acquired					$ 339,641,000	$ 51,594,000	$ 13,899,000
Acquisition consideration					$ 9,600,000	$ 6,149,000
Portworx
Business Acquisition [Line Items]
Total purchase consideration	$ 352,851,000
Goodwill expected to be tax deductible	0
Deferred tax assets, before valuation allowance	14,700,000
Deferred tax assets, valuation allowance	14,700,000
Deferred tax assets, net	0
Transaction price contingent on continuous employment of founders	$ 32,200,000
Transaction price contingent on continuous employment of founders, earnout period	3 years
Net liabilities assumed	$ 4,063,000
Portworx | Replacement Awards
Business Acquisition [Line Items]
Equity interests issued and issuable	26,800,000
Portworx | Replacement Awards for Services Performed Prior to the Acquisition
Business Acquisition [Line Items]
Equity interests issued and issuable	8,800,000
Portworx | Replacement Awards for Future Services
Business Acquisition [Line Items]
Equity interests issued and issuable	18,000,000.0
Portworx | Restricted Stock Units (RSUs)
Business Acquisition [Line Items]
Equity interests issued and issuable	$ 31,800,000
Equity awards vesting period	4 years
Compuverde AB
Business Acquisition [Line Items]
Purchase consideration, net of cash acquired			$ 47,900,000
Long-term debt assumed and subsequently paid off			11,600,000
Net liabilities assumed			11,700,000
Deferred tax liabilities assumed			5,400,000
Consideration to be transferred			$ 15,900,000
Term of payments			2 years
Compuverde AB | Restricted Stock Units (RSUs)
Business Acquisition [Line Items]
Equity interests issued and issuable		$ 3,000,000.0
StorReduce, Inc.
Business Acquisition [Line Items]
Purchase consideration, net of cash acquired				$ 20,500,000
Long-term debt assumed and subsequently paid off				6,100,000
Transaction fees				1,100,000
Net liabilities assumed				4,500,000
Deferred tax liabilities assumed				3,700,000
Acquisition consideration				3,700,000
StorReduce, Inc. | Restricted Stock Units (RSUs)
Business Acquisition [Line Items]
Equity interests issued and issuable				$ 13,600,000
Equity interests issued and issuable, shares issued (in shares)				622,482