Commitments (Details Textual) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Commitments (Textual) [Abstract]
2014	$ 13,527,000
2015	11,955,000
2016	9,539,000
2017	6,643,000
2018	3,814,000
Thereafter	2,319,000
Aggregate	47,797,000
Total rental expense	$ 13,951,000	$ 14,949,000	$ 14,620,000