Pension and Employee Benefit Plans, Valuation Assumptions (Details) - Pension Plans [Member]	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
U.S. Plans [Member]
Weighted-average assumptions used in calculating benefit obligation [Abstract]
Discount rate - benefit obligations	3.40%	4.00%
Weighted-average assumptions used in calculating plan cost [Abstract]
Weighted average discount rate - costs	4.00%	4.00%	4.10%
Non-U.S Plans [Member]
Weighted-average assumptions used in calculating benefit obligation [Abstract]
Discount rate - benefit obligations	1.00%	1.40%
Weighted-average assumptions used in calculating plan cost [Abstract]
Weighted average discount rate - costs	1.70%	1.90%	1.90%