Annual report pursuant to Section 13 and 15(d)

Pension and Other Post-retirement Benefit Plans Pension and Other Post-retirement Benefit Plans (Phantom)

v3.19.1
Pension and Other Post-retirement Benefit Plans Pension and Other Post-retirement Benefit Plans (Phantom) - Other Benefits
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Health Care Cost Trend Rate on Covered Charges 7.00% 7.00%
Defined Benefit Plan Assumptions Used Calculating Benefit Obligation Ultimate Health Care Cost Trend Rate 5.00% 5.00%
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Health Care Cost Trend Rate on Covered Charges 7.00% 7.50%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate 5.00% 5.00%