Goodwill and Other Intangible Assets (Details 2) (USD $)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Other intangible assets
Gross	$ 135,022,000	$ 126,294,000
Accumulated Amortization	(124,493,000)	(100,270,000)
Net	10,529,000	26,024,000
Intangible assets reclassified as held for sale
Intangible assets classified as held for sale	0
Amortization of other intangible assets	17,771,000	23,571,000	27,198,000
Expected amortization expense
Future amortization expense for fiscal year, 2015	8,400,000
Future amortization expense for fiscal year, 2016	1,900,000
Future amortization expense for fiscal year, 2017	200,000
Digital Video Security and Remote product families
Intangible assets reclassified as held for sale
Impairment charges		500,000
Intangible assets, net of accumulated amortization		1,700,000
Accumulated amortization		19,300,000
Trademark and trade names
Other intangible assets
Gross	13,091,000	13,977,000
Accumulated Amortization	(11,949,000)	(10,693,000)
Net	1,142,000	3,284,000
Intangible assets reclassified as held for sale
Fully amortized intangible assets wrongly stated in prior periods	15,900,000
Technology
Other intangible assets
Gross	83,080,000	73,249,000
Accumulated Amortization	(78,257,000)	(61,560,000)
Net	4,823,000	11,689,000
Customer contracts
Other intangible assets
Gross	38,851,000	39,068,000
Accumulated Amortization	(34,287,000)	(28,017,000)
Net	$ 4,564,000	$ 11,051,000