v3.8.0.1
Pension Plans (Schedule of Net Pension Expense) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Retirement Benefits [Abstract]        
Service costs $ 388 $ 363 $ 741 $ 727
Interest costs 249 241 489 484
Amortization of actuarial loss 219 0 422 0
Settlements and curtailments (36) 0 (36) 231
Net pension period cost $ 820 $ 604 $ 1,616 $ 1,442