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Subsequent Event (Details) (USD $) In Millions, unless otherwise specified	Jul. 20, 2011
Subsequent Event
Actual number of shares put back due to the settlement agreement with Samsung within 30 days (in shares)	4.8
Actual value of shares put back within 30 days	$ 100.0
Period within which the payment for put right shares has to be made (in days)	30

X

- Definition

Represents the actual number of shares put back to the entity under the stock purchase agreement within 30 days.

+ Details

Name:	rmbs_ActualNumberOfSharesPutBack
Namespace Prefix:	rmbs
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the actual value for the shares under the put back facility of the stock purchase agreement within 30 days.

+ Details

Name:	rmbs_ActualValueOfSharesPutBack
Namespace Prefix:	rmbs
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the period from the receipt of the put notice to purchase and pay for the put right agreement shares.

+ Details

Name:	rmbs_PeriodWithinWhichPutBackRightStartToBeExercised
Namespace Prefix:	rmbs
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_SubsequentEventsAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration