Pension Benefits (Schedule Of Weighted-Average Assumptions Used To Estimate Net Periodic Pension Expense And Actuarial Present Value Of Benefit Obligations) (Details) (Defined Pension Benefit Plans [Member])	12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Defined Pension Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension expense, Discount rates	4.98%	5.30%	7.68%
Net periodic pension expense, Rate of increase in compensation	3.74%	3.75%	3.62%
Net periodic pension expense, Expected long-term rate of return on plan assets	7.60%	7.79%	7.90%
Benefit obligation, Discount rates	4.23%	4.99%	5.33%
Benefit obligation, Rate of increase in compensation	3.56%	3.74%	3.75%