The total number of new claims filed pertaining to a loss contingency during the period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14435-108349

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

Legal Proceedings and Claims (Details) - claim		2 Months Ended	6 Months Ended
Legal Proceedings and Claims (Details) - claim	Jul. 31, 2019	Aug. 31, 2017	Jul. 31, 2019
Shareholder Derivative Lawsuits
Loss Contingencies [Line Items]
Number of claims filed			3
Tableau Software, Inc. (Tableau) Litigation
Loss Contingencies [Line Items]
Number of claims filed	3	2