Segment Reporting (Details Textual)	12 Months Ended
	Mar. 31, 2012 Customers Segment Rate	Mar. 31, 2011 Rate	Mar. 31, 2010
Segment Reporting (Textual) [Abstract]
Number of business segments	2
Number of largest customers	10
Percentage of total revenue comprised by the Company's ten largest customers	20% or less	20% or less	20% or less
Percentage of cash, cash equivalents and investments held by international subsidiaries	60.00%	46.00%