Document and Entity Information (USD $)	12 Months Ended
	Mar. 31, 2015	May 22, 2015	Sep. 30, 2014
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Mar. 31, 2015
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2015
Trading Symbol	rent
Entity Registrant Name	RENTRAK CORP
Entity Central Index Key	0000800458
Current Fiscal Year End Date	--03-31
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well Known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding		15,253,468
Entity Public Float			$ 732,097,022