Pension and Employee Benefit Plans, Valuation Assumptions (Details) - Pension Plans [Member]	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
U.S. Plans [Member]
Weighted-average assumptions used in calculating benefit obligation [Abstract]
Discount rate - benefit obligations	4.00%	4.10%
Weighted-average assumptions used in calculating plan cost [Abstract]
Weighted average discount rate - costs	4.10%	4.10%	4.30%
Foreign Plan [Member]
Weighted-average assumptions used in calculating benefit obligation [Abstract]
Discount rate - benefit obligations	1.70%	1.70%
Weighted-average assumptions used in calculating plan cost [Abstract]
Weighted average discount rate - costs	1.90%	1.70%	1.30%