Annual report pursuant to Section 13 and 15(d)

Pension and Other Post-retirement Benefit Plans - Fair Value (Details)

v3.19.1
Pension and Other Post-retirement Benefit Plans - Fair Value (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Actual Plan Asset Allocations 100.00%    
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 100.00%    
Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Actual Plan Asset Allocations 1.00%    
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 1.00%    
Other      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Actual Plan Asset Allocations 7.00%    
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 4.00%    
International Equities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Actual Plan Asset Allocations 31.00%    
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 34.00%    
International Bonds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Actual Plan Asset Allocations 61.00%    
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 61.00%    
Pension      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 63,902 $ 71,491 $ 10,004
Actual return on plan assets 1,165 2,594  
Employer contributions 7,882 4,766  
Settlements (12,379) (5,659)  
Benefits paid (1,096) (1,128)  
Foreign currency exchange rate change (3,161) 3,831  
Pension | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 319 193  
Pension | International equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 19,965 22,391  
Pension | International bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 39,030 43,742  
Pension | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 642 697  
Pension | Mutual Fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,946 4,468  
Pension | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 319 193  
Pension | Level 1 | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 319 193  
Pension | Level 1 | International equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension | Level 1 | International bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension | Level 1 | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 62,941 70,601  
Pension | Level 2 | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension | Level 2 | International equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 19,965 22,391  
Pension | Level 2 | International bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 39,030 43,742  
Pension | Level 2 | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension | Level 2 | Mutual Fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3,946 4,468  
Pension | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 642 697 $ 580
Actual return on plan assets 20 41  
Employer contributions 233 219  
Benefits paid (247) (233)  
Foreign currency exchange rate change (61) 90  
Pension | Level 3 | Cash and Cash Equivalents [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension | Level 3 | International equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension | Level 3 | International bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Pension | Level 3 | Insurance contracts      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 642 $ 697