Share Based Awards (Details 3)	3 Months Ended	6 Months Ended
	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Schedule of Performance Based Awards Under Incentive plan
Expected life (in years)		4 years 10 months 24 days	5 years
Performance Based Award [Member]
Schedule of Performance Based Awards Under Incentive plan
Expected life (in years)		4 years 10 months 24 days	5 years
Risk-free rate		1.40%
Minimum [Member]
Schedule of Performance Based Awards Under Incentive plan
Expected dividends		3.10%	2.40%
Risk-free rate		1.00%	0.70%
Minimum [Member] | Performance Based Award [Member]
Schedule of Performance Based Awards Under Incentive plan
Expected volatility		41.00%	41.70%
Expected dividends		3.20%	2.50%
Risk-free rate			0.60%
Maximum [Member]
Schedule of Performance Based Awards Under Incentive plan
Expected dividends		3.90%	3.80%
Risk-free rate	0.80%	1.50%
Maximum [Member] | Performance Based Award [Member]
Schedule of Performance Based Awards Under Incentive plan
Expected volatility		43.50%	45.00%
Expected dividends		3.70%	3.80%
Risk-free rate			0.70%