Share Based Awards (Details 1)	12 Months Ended
	Mar. 31, 2012 Y	Mar. 31, 2011 Y	Mar. 31, 2011 Minimum [Member]	Mar. 31, 2010 Minimum [Member] Y	Mar. 31, 2011 Maximum [Member]	Mar. 31, 2010 Maximum [Member] Y
Schedule of Share Based Compensation Valuation Assumption
Expected life	4.3	4.2		4.4		4.8
Expected volatility	41.20%		42.60%	45.50%	44.70%	47.70%
Expected Dividends	1.60%		1.90%	1.90%	2.20%	2.20%
Risk-free rate	1.80%		1.50%	0.80%	2.10%	2.40%