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Employee Retirement Plans (Weighted Average Assumptions) (Details)
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Expected return on plan assets, net of administrative fees 6.25% 6.25%
Rate of compensation increase 0.00% 0.00%
Minimum    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 3.93% 3.92%
Maximum    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 4.07% 4.21%