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Employee Benefit Plans (Details 3) (USD $)
In Thousands, unless otherwise specified
12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Mar. 31, 2014
Pension Benefits
Mar. 31, 2013
Pension Benefits
Mar. 31, 2012
Pension Benefits
Mar. 31, 2013
Pension Benefits
Domestic
Mar. 31, 2013
Pension Benefits
International
Mar. 31, 2014
Other Postretirement Benefits
Mar. 31, 2013
Other Postretirement Benefits
Mar. 31, 2013
Equity Investment
Pension Benefits
Domestic
Mar. 31, 2012
Equity Investment
Pension Benefits
Domestic
Mar. 31, 2013
Equity Investment
Pension Benefits
International
Mar. 31, 2012
Equity Investment
Pension Benefits
International
Mar. 31, 2013
Fixed Income Investment
Pension Benefits
Mar. 31, 2012
Fixed Income Investment
Pension Benefits
Mar. 31, 2013
Real Estate
Pension Benefits
Mar. 31, 2012
Real Estate
Pension Benefits
Mar. 31, 2013
Hedge Funds, Equity
Pension Benefits
Mar. 31, 2012
Hedge Funds, Equity
Pension Benefits
Mar. 31, 2013
Cash Investment
Pension Benefits
Mar. 31, 2012
Cash Investment
Pension Benefits
Assumed Health Care Cost Trend Rates used to Measure Expected Cost of Benefits                                      
Weighted average health care cost trend rate (as a percent)           7.60% 7.70%                        
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) (as a percent)           5.00% 5.00%                        
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             $ 326                        
Effect on total of service and interest cost, one percentage point decrease             (284)                        
Effect on postretirement benefit obligation, one percentage point increase             8,552                        
Effect on postretirement benefit obligation, one percentage point decrease             $ (7,479)                        
Target asset allocation                                      
Asset allocation percentage, minimum       20.00% 10.00%             30.00%   5.00%   5.00%   0.00%  
Asset allocation percentage, maximum       30.00% 20.00%             40.00%   15.00%   27.00%   6.00%  
Total (as a percent) 100.00%                                    
Actual plan asset allocation                                      
Actual plan asset allocation (as a percent)   100.00% 100.00%         25.00% 25.80% 14.70% 14.70% 37.80% 37.60% 7.20% 7.20% 12.80% 12.90% 2.50% 1.80%
Total (as a percent)   100.00% 100.00%         25.00% 25.80% 14.70% 14.70% 37.80% 37.60% 7.20% 7.20% 12.80% 12.90% 2.50% 1.80%