Financial Instruments - Narrative (Details) - USD ($)	Apr. 30, 2025	Jan. 31, 2025
Fair Value Disclosures [Abstract]
Short-term investments accumulated impairment loss	$ 0	$ 0

Short-Term Investments, Accumulated Impairment Loss

No definition available.

Name:	rbrk_ShortTermInvestmentsAccumulatedImpairmentLoss
Namespace Prefix:	rbrk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant