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Employee Benefit Plans (Details 3) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Dec. 31, 2015
Mar. 31, 2015
Other Postretirement Benefits    
Assumed Health Care Cost Trend Rates used to Measure Expected Cost of Benefits    
Weighted average health care cost trend rate (as a percent) 6.10% 6.10%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) (as a percent) 4.50% 4.50%
Effect of one-percentage point increase or decrease in the assumed health care cost trend rates    
Effect on total of service and interest cost, one percentage point increase $ 286  
Effect on total of service and interest cost, one percentage point decrease (253)  
Effect on postretirement benefit obligation, one percentage point increase 6,888  
Effect on postretirement benefit obligation, one percentage point decrease $ (6,118)  
Equity Investment    
Anticipated 2016    
Asset allocation percentage, minimum 20.00%  
Asset allocation percentage, maximum 45.00%  
Equity Investment | Pension Benefits | Domestic    
Anticipated 2016    
Asset allocation percentage, minimum 10.00%  
Asset allocation percentage, maximum 25.00%  
Actual    
Actual plan asset allocation (as a percent) 19.90% 20.70%
Equity Investment | Pension Benefits | International    
Anticipated 2016    
Asset allocation percentage, minimum 10.00%  
Asset allocation percentage, maximum 20.00%  
Actual    
Actual plan asset allocation (as a percent) 13.10% 13.70%
Fixed Income Investment    
Anticipated 2016    
Asset allocation percentage, minimum 35.00%  
Asset allocation percentage, maximum 50.00%  
Fixed Income Investment | Pension Benefits    
Anticipated 2016    
Asset allocation percentage, minimum 35.00%  
Asset allocation percentage, maximum 50.00%  
Actual    
Actual plan asset allocation (as a percent) 40.50% 42.50%
Real Estate    
Anticipated 2016    
Asset allocation percentage, minimum 0.00%  
Asset allocation percentage, maximum 10.00%  
Real Estate | Pension Benefits    
Anticipated 2016    
Asset allocation percentage, minimum 0.00%  
Asset allocation percentage, maximum 10.00%  
Actual    
Actual plan asset allocation (as a percent) 5.00% 4.80%
Hedge Funds, Equity    
Anticipated 2016    
Asset allocation percentage, minimum 15.00%  
Asset allocation percentage, maximum 30.00%  
Hedge Funds, Equity | Pension Benefits    
Anticipated 2016    
Asset allocation percentage, minimum 15.00%  
Asset allocation percentage, maximum 30.00%  
Actual    
Actual plan asset allocation (as a percent) 16.80% 14.80%
Cash Investment    
Anticipated 2016    
Asset allocation percentage, minimum 0.00%  
Asset allocation percentage, maximum 6.00%  
Cash Investment | Pension Benefits    
Anticipated 2016    
Asset allocation percentage, minimum 0.00%  
Asset allocation percentage, maximum 6.00%  
Actual    
Actual plan asset allocation (as a percent) 4.70% 3.50%