Cash and Cash Equivalents (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2011
Cash and Cash Equivalents, at Carrying Value [Abstract]
Cash and cash equivalents	$ 118,993	$ 103,145	$ 105,999	$ 134,444
Maximum maturities period of cash and cash equivalents	90 days