Employee Benefit Plan	12 Months Ended
Jan. 31, 2021
Postemployment Benefits [Abstract]
Employee Benefit Plan	Employee Benefit PlanWe have a qualified defined contribution plan under Section 401(k) of the Internal Revenue Code (the “Plan”). This Plan covers substantially all employees who meet minimum age and service requirements and allows participants to defer a portion of their annual compensation on a pre-tax basis. In the fourth quarter of fiscal 2019, we began to match 50% of each participant’s contribution up to a maximum of 6% of the participant’s base salary and commissions paid during the period. During the year ended January 31, 2021, 2020 and 2019, we recognized expenses of $18.9 million, $11.0 million and $1.7 million related to matching contributions.

The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-URI http://asc.fasb.org/topic&trid=2228938

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 712
-URI http://asc.fasb.org/topic&trid=2197446

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-URI http://asc.fasb.org/topic&trid=2127225

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-URI http://asc.fasb.org/topic&trid=2235017

Name:	us-gaap_CompensationAndEmployeeBenefitPlansTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration