Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Income Statement [Abstract]
Revenue	$ 99,177	$ 91,071	$ 97,088
Cost of sales	53,631	48,125	54,853
Gross margin	45,546	42,946	42,235
Operating expenses:
Selling and administrative	67,757	48,854	44,838
Loss from operations	(22,211)	(5,908)	(2,603)
Other income:
Interest income, net	406	478	470
Other income (expense), net	(29)	(1)	125
Loss before income taxes	(21,834)	(5,431)	(2,008)
Provision (benefit) for income taxes	844	995	(1,241)
Net loss	(22,678)	(6,426)	(767)
Net loss attributable to noncontrolling interest	(61)	0	0
Net loss attributable to Rentrak Corporation	$ (22,617)	$ (6,426)	$ (767)
Net loss per share attributable to Rentrak Corporation common stockholders:
Basic (per share)	$ (1.93)	$ (0.57)	$ (0.07)
Diluted (per share)	$ (1.93)	$ (0.57)	$ (0.07)
Shares used in per share calculations:
Basic (shares)	11,733	11,197	10,962
Diluted (shares)	11,733	11,197	10,962