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Employee Benefit Plan (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jan. 31, 2021	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2019
Postemployment Benefits [Abstract]
Percentage of participant's contribution matched by employer	50.00%
Employer matching contribution, maximum percentage of participant's base salary	6.00%
Defined contribution plan expense		$ 18.9	$ 11.0	$ 1.7

X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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Balance Type:	debit
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X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage employer matches of the employee's percentage contribution matched.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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