Description of the Business and Basis of Presentation (Details)	12 Months Ended
Jan. 31, 2020 segment
Class of Stock [Line Items]
Number of reportable segments	1
IPO \| Denali
Class of Stock [Line Items]
Percent of outstanding shares owned	86.20%
Percent of voting interests owned	98.40%

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration