Pension Benefits - Schedule Of Weighted-Average Assumptions Used to Estimate Net Periodic Pension Expense and Actuarial Present Value of Benefit Obligations (Details)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
U.S. Plans
Net periodic pension expense
Discount rates	3.40%	3.36%	3.74%
Rate of increase in compensation	4.00%	4.00%	4.00%
Expected long-term rate of return on plan assets	6.25%	6.75%	7.25%
Benefit obligation
Discount rates	3.39%	3.27%	3.18%
Rate of increase in compensation	4.00%	4.00%	4.00%
Non-U.S. Plans
Net periodic pension expense
Discount rates	2.72%	2.36%	3.85%
Rate of increase in compensation	2.76%	2.80%	3.11%
Expected long-term rate of return on plan assets	4.51%	4.87%	5.39%
Benefit obligation
Discount rates	2.35%	2.84%	2.50%
Rate of increase in compensation	3.18%	2.98%	3.24%