Share Based Awards (Details 3)	6 Months Ended
	Sep. 30, 2012 Y	Sep. 30, 2011 Y
Schedule of Performance Based Awards Under Incentive plan
Expected life (in years)	5.0	4.3
Performance Based Award [Member]
Schedule of Performance Based Awards Under Incentive plan
Expected life (in years)	5.0	4.3
Minimum [Member]
Schedule of Performance Based Awards Under Incentive plan
Expected volatility	41.70%	41.20%
Expected dividends	2.50%	1.40%
Risk-free rate	0.60%	1.00%
Maximum [Member]
Schedule of Performance Based Awards Under Incentive plan
Expected volatility	45.00%	42.20%
Expected dividends	3.80%	1.60%
Risk-free rate	0.70%	1.80%