Annual report pursuant to Section 13 and 15(d)

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

v3.19.1
Pension and Other Post-retirement Benefit Plans - Summary of Change in Benefit Obligation (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2019
Mar. 31, 2018
Funded status at end of year          
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months       $ 6,758  
Defined Benefit Plan, Expected Future Benefit Payment, Year Two       6,726  
Defined Benefit Plan, Expected Future Benefit Payment, Year Three       8,458  
Defined Benefit Plan, Expected Future Benefit Payment, Year Four       8,163  
Defined Benefit Plan, Expected Future Benefit Payment, Year Five       9,861  
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter       54,212  
Pension          
Defined Benefit Plan Disclosure [Line Items]          
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax $ (1,684) $ 184 $ (1,229)    
Change in Benefit Obligation          
Benefit obligation at beginning of the year 161,673 45,171      
Service cost 4,716 4,585 1,298    
Interest cost 1,815 1,750 1,297    
Plan participants’ contributions 0 0      
Actuarial (gain) loss 1,146 437      
Foreign currency exchange rate change (8,402) 9,934      
Gross benefits paid (1,097) (1,128)      
Curtailments and settlements (11,411) (5,642)      
Defined Benefit Plan, Benefit Obligation, Business Combination 0 106,566      
Benefit obligation at end of year 148,440 161,673 45,171    
Change in Plan Assets          
Fair value of plan assets at beginning of year 71,491 10,004      
Actual return on plan assets 1,165 2,594      
Foreign currency exchange rate changes (3,161) 3,831      
Employer contributions (7,882) (4,766)      
Settlements (12,379) (5,659)      
Plan participants’ contributions 0 0      
Gross benefits paid 1,096 1,128      
Acquisitions 0 57,083      
Fair value of plan assets at end of year 63,902 71,491 10,004    
Funded status at end of year          
Fair value of plan assets 71,491 10,004 10,004 63,902 $ 71,491
Benefit obligations (161,673) (45,171) (45,171) (148,440) (161,673)
Amount recognized at end of year       (84,538) (90,182)
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months       6,707  
Defined Benefit Plan, Expected Future Benefit Payment, Year Two       6,679  
Defined Benefit Plan, Expected Future Benefit Payment, Year Three       8,416  
Defined Benefit Plan, Expected Future Benefit Payment, Year Four       8,126  
Defined Benefit Plan, Expected Future Benefit Payment, Year Five       9,828  
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter       54,107  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax (511) (322) (619)    
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 87 87 82    
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent 1,086 (593) 528    
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax 6,178 4,195 3,267    
Other Benefits          
Defined Benefit Plan Disclosure [Line Items]          
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 81 (64) 228    
Change in Benefit Obligation          
Benefit obligation at beginning of the year 367 386      
Service cost 0 0 0    
Interest cost 11 12 11    
Plan participants’ contributions 641 536      
Actuarial (gain) loss (81) 64      
Foreign currency exchange rate change 0 0      
Gross benefits paid (626) (631)      
Curtailments and settlements 0 0      
Defined Benefit Plan, Benefit Obligation, Business Combination 0 0      
Benefit obligation at end of year 312 367 386    
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 (15) (95)      
Settlements 0 0      
Plan participants’ contributions 641 536      
Gross benefits paid 626 631      
Acquisitions 0 0      
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 (367) (386) (386) (312) (367)
Amount recognized at end of year       (312) $ (367)
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months       51  
Defined Benefit Plan, Expected Future Benefit Payment, Year Two       47  
Defined Benefit Plan, Expected Future Benefit Payment, Year Three       42  
Defined Benefit Plan, Expected Future Benefit Payment, Year Four       37  
Defined Benefit Plan, Expected Future Benefit Payment, Year Five       33  
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter       $ 105  
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax 167 191 208    
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 86 255 (20)    
Defined Benefit Plan, Amount Recognized in Net Periodic Benefit Cost (Credit) and Other Comprehensive (Income) Loss, before Tax $ (70) $ 76 $ (216)