Treasury Stock (Details Textual) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2013 Future Shares [Member]	Feb. 29, 2012 Maximum [Member]	Feb. 29, 2012 Minimum [Member]
Treasury Stock and Subsequent Event (Textual) [Abstract]
Number of shares authorized to repurchase					16,000,000	1,000,000
Shares repurchased	705,406	461,938	715,975	92,658
Common stock repurchased, value	$ 30,727,000	$ 21,643,000	$ 30,608,000	$ 4,500,000
Shares repurchased, cost per shares	$ 43.56	$ 46.85	$ 42.75	$ 48.67