Document and Entity Information (USD $)	12 Months Ended
	Mar. 31, 2013	Jun. 03, 2013	Sep. 30, 2012
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Mar. 31, 2013
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2013
Trading Symbol	rent
Entity Registrant Name	RENTRAK CORP
Entity Central Index Key	0000800458
Current Fiscal Year End Date	--03-31
Entity Filer Category	Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well Known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding		11,891,638
Entity Public Float			$ 193,963,421