Intangible Assets (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Activity Related to the intangible assets
Beginning Balance	$ 16,890	$ 20,145
Acquisition	10,870
Amortization	(4,501)	(3,255)	(1,783)
Ending Balance	23,259	16,890	20,145
Customer Relationships [Member]
Activity Related to the intangible assets
Beginning Balance	6,327	7,849
Acquisition	3,500
Amortization	(2,022)	(1,522)
Ending Balance	7,805	6,327
Trade Name [Member]
Activity Related to the intangible assets
Beginning Balance	208	368
Acquisition	130
Amortization	(176)	(160)
Ending Balance	162	208
Software Technology [Member]
Activity Related to the intangible assets
Beginning Balance	10,355	11,928
Acquisition	7,240
Amortization	(2,303)	(1,573)
Ending Balance	$ 15,292	$ 10,355