Share Based Awards (Details 3)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Schedule of Performance Based Awards Under Incentive plan
Expected volatility, Minimum Rate	41.70%	41.20%
Expected volatility, Maximum Rate	45.00%	42.20%
Expected volatility			41.60%
Expected dividends			1.50%
Risk-free rate, Minimum Rate	0.60%	0.80%
Risk-free rate, Maximum Rate	0.70%	1.80%
Risk-free rate			2.20%
Minimum [Member]
Schedule of Performance Based Awards Under Incentive plan
Expected dividends	2.50%	1.40%
Maximum [Member]
Schedule of Performance Based Awards Under Incentive plan
Expected dividends	4.00%	1.90%
Performance Shares [Member]
Schedule of Performance Based Awards Under Incentive plan
Expected life	5 years 0 months 18 days	4 years 3 months 18 days	4 years 3 months 18 days