XML 80 R66.htm IDEA: XBRL DOCUMENT v3.8.0.1
Pension And Other Postretirement Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Revised healthcare cost trend assumption 8.10%    
Ultimate healthcare cost trend rate 4.50%    
Year that rate reaches healthcare cost trend rate 2026    
Net actuarial loss expected in net periodic benefit cost during fiscal year 2014 $ 5,200    
Prior service benefit expected in net periodic benefit cost during fiscal year 2014 $ 2,400    
Percentage of total plan assets 94.00%    
Percentage of total projected benefit obligation 82.00%    
Expected company contributions in next fiscal year $ 15,300    
Pension and Other Postretirement Benefits Cost (Reversal of Cost) 2,300 $ 2,600 $ 2,400
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Funded status of the plans, end of year $ 44,090 $ 49,099  
Percentage of funded status of plans 87.00%    
Other Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Revised healthcare cost trend assumption 8.10% 6.70% 7.00%
Funded status of the plans, end of year $ 29,478 $ 33,732  
Percentage of funded status of plans 95.00%    
Non-ERISA regulated and Other Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected company contributions in next fiscal year $ 9,300    
ERISA-regulated U.S. plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Expected company contributions in next fiscal year $ 6,000