Commitments and Contingencies - Narrative (Details) $ in Millions	Jun. 07, 2019 defendant directorOrOfficer	Apr. 30, 2020 USD ($)	Jan. 31, 2020 USD ($)	Oct. 16, 2019 directorOrOfficer derivativeAction	Sep. 05, 2019 directorOrOfficer	Sep. 03, 2019 directorOrOfficer	Jul. 30, 2019 directorOrOfficer
Loss Contingencies [Line Items]
Letters of credit | $		$ 19.9	$ 19.9
In re Cloudera, Inc. Securities Litigation
Loss Contingencies [Line Items]
Loss contingency, number of defendants | defendant	3
Loss contingency, number of directors or officers	10
Lazard v. Cloudera, Inc
Loss Contingencies [Line Items]
Loss contingency, number of directors or officers	13
Lee, et al. v. Cole, et al.
Loss Contingencies [Line Items]
Loss contingency, number of directors or officers							11
Slattery v. Reilly, et al.
Loss Contingencies [Line Items]
Loss contingency, number of directors or officers					13
Frentzel v. Bearden, et al.
Loss Contingencies [Line Items]
Loss contingency, number of directors or officers				13
Loss contingency, number of derivative actions | derivativeAction				3
Chen v. Reilly, et al.
Loss Contingencies [Line Items]
Loss contingency, number of directors or officers						13