Business Segments and Enterprise-Wide Disclosures (Revenues and Long-lived Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Revenue from External Customer [Line Items]
Revenue	$ 99,177	$ 91,071	$ 97,088
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	31,656	29,112
HE
Revenue from External Customer [Line Items]
Revenue	45,067	49,656	62,504
HE | PPT
Revenue from External Customer [Line Items]
Revenue	42,145	44,027	56,705
HE | DRS
Revenue from External Customer [Line Items]
Revenue	2,922	5,629	5,799
AMI
Revenue from External Customer [Line Items]
Revenue	54,110	41,415	34,584
AMI | Box Office Essentials
Revenue from External Customer [Line Items]
Revenue	23,949	21,046	18,255
AMI | OnDemand Everywhere
Revenue from External Customer [Line Items]
Revenue	12,562	11,143	10,537
AMI | TV Essentials
Revenue from External Customer [Line Items]
Revenue	17,599	9,226	5,792
Geographic Concentration Risk
Revenue from External Customer [Line Items]
Revenue attributed to foreign countries as a percent of total	10.30%	11.30%	9.20%
Geographic Areas, Revenues from External Customers [Abstract]
Revenue from external customers in the United States	88,978	80,771	88,156
Revenue from external customers outside the United States	10,199	10,300	8,932
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets located in the United States	25,894	22,482
Long-lived assets located outside of the United States	$ 5,762	$ 6,630