Share Based Awards (Details 4) (USD $)	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Schedule of Employee Stock Options and Performance Based Awards by Nonvested Stock Options
Non-Vested Number of Shares Outstanding Beginning Balance	803,036		930,690
Weighted Average Fair Value Price Outstanding Beginning Balance	$ 8.08		$ 5.87
Non-Vested Number of Shares Granted	459,400	110,000	578,968
Weighted Average Fair Value Price Granted	$ 13.32	$ 9.24	$ 9.65
Non-Vested Number of Shares Vested	(312,655)	(379,694)	(287,986)
Weighted Average Fair Value Price Vested	$ 7.22	$ 6.43	$ 6.02
Non-Vested Number of Shares Forfeited	(171,462)	(148,942)
Weighted Average Fair Value Price Forfeited	$ 11.55	$ 9.41
Non-Vested Number of Share Outstanding Ending Balance	778,319		1,221,672
Weighted Average Fair Value Price Outstanding Ending Balance	$ 10.76		$ 7.63