CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2024	Mar. 31, 2023
Statement of Cash Flows [Abstract]
Property, plant and equipment received and accrued in accounts payable and other liabilities, cumulative amounts	$ 22.6	$ 37.5

Noncash or Part Noncash Acquisition, Fixed Assets Acquired, Cumulative

No definition available.

Name:	rmbs_NoncashOrPartNoncashAcquisitionFixedAssetsAcquiredCumulative
Namespace Prefix:	rmbs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant