Description of the Business and Significant Accounting Policies Revenue Recognition (Details 2)	6 Months Ended
Jul. 31, 2020
Minimum
Revenue Recognition
Accounts receivable payment terms	30 days
Maximum
Revenue Recognition
Accounts receivable payment terms	60 days

Represents the period within which the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business should be paid.

No definition available.

Name:	splk_AccountsReceivablePaymentPeriod
Namespace Prefix:	splk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration