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Balance Sheet Components - Schedule of Other Long-Term Assets (Parenthetical) (Details) - USD ($) $ in Millions	3 Months Ended
	Apr. 30, 2020	Jan. 31, 2020
Property Plant And Equipment [Line Items]
Capitalized stock-based compensation expenses	$ 5.6	$ 5.0
Accumulated amortization of capitalized software costs	3.6	$ 1.7
Amortization expense related to capitalized software	$ 1.9
On-premises software | Maximum
Property Plant And Equipment [Line Items]
Finite-lived intangible asset, estimated useful life	4 years
On-premises software | Minimum
Property Plant And Equipment [Line Items]
Finite-lived intangible asset, estimated useful life	3 years

X

- Definition

Capitalized stock-based compensation expense.

+ References

No definition available.

+ Details

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X

- Definition

For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756

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X

- Definition

Amount of expense for amortization of capitalized computer software costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 985
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- 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.

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