Annual report pursuant to Section 13 and 15(d)

Pension and Other Post-retirement Benefit Plans - Summary of Change in Benefit Obligation (Details)

v3.20.1
Pension and Other Post-retirement Benefit Plans - Summary of Change in Benefit Obligation (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2020
Mar. 31, 2019
Funded status at end of year          
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months       $ 6,486  
Defined Benefit Plan, Expected Future Benefit Payment, Year Two       7,936  
Defined Benefit Plan, Expected Future Benefit Payment, Year Three       7,391  
Defined Benefit Plan, Expected Future Benefit Payment, Year Four       9,187  
Defined Benefit Plan, Expected Future Benefit Payment, Year Five       9,894  
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter       52,767  
Pension          
Defined Benefit Plan Disclosure [Line Items]          
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax $ (588) $ (1,684) $ 184    
Change in Benefit Obligation          
Benefit obligation at beginning of the year 148,440 161,673      
Service cost 4,562 4,716 4,585    
Interest cost 1,830 1,815 1,750    
Plan participants’ contributions 0 0      
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 792 0      
Actuarial (gain) loss (1,860) 1,146      
Foreign currency exchange rate change (1,684) (8,402)      
Gross benefits paid (5,153) (1,097)      
Curtailments and settlements (6,086) (11,411)      
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change (13) 0      
Benefit obligation at end of year 140,828 148,440 161,673    
Change in Plan Assets          
Fair value of plan assets at beginning of year 63,902 71,491      
Actual return on plan assets (543) 1,165      
Foreign currency exchange rate changes 487 (3,161)      
Employer contributions (10,208) (7,882)      
Settlements (7,700) (12,379)      
Plan participants’ contributions 0 0      
Gross benefits paid 5,153 1,096      
Fair value of plan assets at end of year 61,201 63,902 71,491    
Funded status at end of year          
Fair value of plan assets 63,902 63,902 71,491 61,201 $ 63,902
Benefit obligations (148,440) (148,440) (161,673) (140,828) (148,440)
Amount recognized at end of year       (79,627) (84,538)
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months       6,438  
Defined Benefit Plan, Expected Future Benefit Payment, Year Two       7,893  
Defined Benefit Plan, Expected Future Benefit Payment, Year Three       7,353  
Defined Benefit Plan, Expected Future Benefit Payment, Year Four       9,154  
Defined Benefit Plan, Expected Future Benefit Payment, Year Five       9,866  
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter       52,682  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax (779) (511) (322)    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax 792 0 0    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax 83 87 87    
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent 518 1,086 (593)    
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax 7,473 6,178 4,195    
Other Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 2 81 (64)    
Change in Benefit Obligation          
Benefit obligation at beginning of the year 312 367      
Service cost 0 0 0    
Interest cost 9 11 12    
Plan participants’ contributions 553 641      
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0 0      
Actuarial (gain) loss (2) (81)      
Foreign currency exchange rate change 0 0      
Gross benefits paid (594) (626)      
Curtailments and settlements 0 0      
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change 0 0      
Benefit obligation at end of year 278 312 367    
Change in Plan Assets          
Fair value of plan assets at beginning of year 0 0      
Actual return on plan assets 0 0      
Foreign currency exchange rate changes 0 0      
Employer contributions (41) (15)      
Settlements 0 0      
Plan participants’ contributions 553 641      
Gross benefits paid 594 626      
Fair value of plan assets at end of year 0 0 0    
Funded status at end of year          
Fair value of plan assets 0 0 0 0 0
Benefit obligations (312) (312) (367) (278) (312)
Amount recognized at end of year       (278) $ (312)
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months       48  
Defined Benefit Plan, Expected Future Benefit Payment, Year Two       43  
Defined Benefit Plan, Expected Future Benefit Payment, Year Three       38  
Defined Benefit Plan, Expected Future Benefit Payment, Year Four       33  
Defined Benefit Plan, Expected Future Benefit Payment, Year Five       28  
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter       $ 85  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax 148 167 191    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax 0 0 0    
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax 0 0 0    
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent 146 86 255    
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax $ 7 $ (70) $ 76