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Leases Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018
Other Commitments [Line Items]
Sublease income	$ 3.2	$ 0.0	$ 0.0
Weighted average remaining lease term	7 years 10 months 24 days	8 years 10 months 24 days
Weighted average discount rate	5.70%	5.80%
Operating lease payments	$ 18.3	$ 12.9
Lease not yet commenced, undiscounted amount	$ 56.9
Minimum
Other Commitments [Line Items]
Lease not yet commenced, term of contract	1 year 3 months 18 days
Maximum
Other Commitments [Line Items]
Lease not yet commenced, term of contract	8 years 8 months 12 days
San Francisco - Ten Year Lease
Other Commitments [Line Items]
Operating lease term	10 years
Operating lease renewal term	5 years

X

- Definition

Lessee, Operating Lease, Lease Not Yet Commenced, Undiscounted Amount

+ References

No definition available.

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X

- 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
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- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 3
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- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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.

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Amount of sublease income excluding finance and operating lease expense.

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