Commitments and Contingencies - Narrative (Details) $ in Millions	Jun. 07, 2019 directorsOrOfficers defendants	Jan. 31, 2020 USD ($)	Oct. 16, 2019 numberOfDerivativeActions directorsOrOfficers	Sep. 05, 2019 directorsOrOfficers	Sep. 03, 2019 directorsOrOfficers	Jul. 30, 2019 directorsOrOfficers	Jan. 31, 2019 USD ($)
Loss Contingencies [Line Items]
Letters of credit | $		$ 19.9					$ 20.0
Christine V. Cloudera, Inc
Loss Contingencies [Line Items]
Loss contingency, number of defendants | defendants	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 | numberOfDerivativeActions			3
Chen v. Reilly, et al.
Loss Contingencies [Line Items]
Loss contingency, number of directors or officers					13