Share Based Awards (Details 3)	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Schedule of Performance Based Awards Under Incentive plan
Expected life (in years)	3 years 11 months	4 years 9 months		4 years 10 months
Expected volatility	38.90%	36.40%
Expected dividends	5.30%	4.40%
Risk-free rate	1.30%	1.70%		1.70%
Minimum [Member]
Schedule of Performance Based Awards Under Incentive plan
Expected volatility			38.30%	36.40%
Expected dividends			4.10%	4.30%
Risk-free rate			1.30%
Maximum [Member]
Schedule of Performance Based Awards Under Incentive plan
Expected volatility			38.90%	36.60%
Expected dividends			5.30%	4.40%
Risk-free rate			1.60%
Performance Based Award [Member]
Schedule of Performance Based Awards Under Incentive plan
Expected life (in years)			3 years 10 months 25 days	4 years 9 months
Expected volatility	38.30%	36.40%
Expected dividends	5.50%	5.00%
Risk-free rate	1.10%	1.80%
Performance Based Award [Member] | Minimum [Member]
Schedule of Performance Based Awards Under Incentive plan
Expected volatility			37.70%	36.40%
Expected dividends			4.10%	4.30%
Risk-free rate			1.10%	1.60%
Performance Based Award [Member] | Maximum [Member]
Schedule of Performance Based Awards Under Incentive plan
Expected volatility			38.30%	36.50%
Expected dividends			5.50%	5.00%
Risk-free rate			1.60%	1.80%