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Retirement Plans - (Net Periodic Benefit Cost) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
United States Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 154 157 308 316
Expected return on plan assets (114) (135) (226) (257)
Amortization and deferral 51 36 103 92
Net periodic benefit cost 91 58 185 151
International Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 227 252 462 507
Interest cost 364 457 740 927
Expected return on plan assets (518) (535) (1,056) (1,087)
Amortization and deferral 245 304 498 616
Net periodic benefit cost $ 318 $ 478 $ 644 $ 963