Document And Entity Information	6 Months Ended
	Sep. 30, 2014	Oct. 31, 2014
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2014
Document Fiscal Period Focus	Q2
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	Accelerated Filer
Entity Common Stock, Shares Outstanding		12,364,924