Benefit Plans (Projected benefit obligation exceeding the fair value of plan assets) (Details) - USD ($)
$ in Thousands |
12 Months Ended |
|
Mar. 31, 2020 |
Mar. 31, 2019 |
Mar. 31, 2018 |
Sep. 30, 2008 |
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
|
| Defined Benefit Plan, Accumulated Benefit Obligation |
|
|
|
$ 46,001
|
| Other Defined Benefit Pension Plans [Member] |
|
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
|
| Defined Benefit Plan, Benefit Obligation |
$ 123,190
|
$ 133,672
|
$ 148,848
|
|
| Defined Benefit Plan, Plan Assets, Amount |
112,203
|
117,504
|
119,441
|
|
| Defined Benefit Plan, Accumulated Benefit Obligation |
120,084
|
130,669
|
|
|
| Defined Benefit Plan, Service Cost |
1,380
|
2,394
|
2,402
|
|
| Defined Benefit Plan, Amortization of Prior Service Cost (Credit) |
69
|
51
|
0
|
|
| Defined Benefit Plan, Interest Cost |
2,876
|
3,139
|
3,262
|
|
| Defined Benefit Plan, Actuarial Net (Gains) Losses |
(3,736)
|
(4,402)
|
|
|
| Defined Benefit Plan, Benefit Obligation, Benefits Paid |
6,466
|
6,150
|
|
|
| Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant |
1,046
|
743
|
|
|
| Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) |
(5,661)
|
(11,847)
|
|
|
| Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) |
228
|
6,543
|
|
|
| Defined Benefit Plan, Plan Assets, Contributions by Employer |
5,071
|
5,005
|
|
|
| Defined Benefit Plan, Plan Assets, Contributions by Plan Participant |
1,045
|
742
|
|
|
| Defined Benefit Plan, Plan Assets, Benefits Paid |
6,466
|
6,150
|
|
|
| Defined Benefit Plan, Funded (Unfunded) Status of Plan |
(10,987)
|
(16,168)
|
|
|
| Other Postretirement Benefit Plans, Defined Benefit |
|
|
|
|
| Defined Benefit Plan Disclosure [Line Items] |
|
|
|
|
| Defined Benefit Plan, Benefit Obligation |
11,368
|
12,551
|
14,100
|
|
| Defined Benefit Plan, Plan Assets, Amount |
0
|
0
|
0
|
|
| Defined Benefit Plan, Service Cost |
0
|
0
|
0
|
|
| Defined Benefit Plan, Amortization of Prior Service Cost (Credit) |
(3,263)
|
(3,263)
|
(3,263)
|
|
| Defined Benefit Plan, Interest Cost |
409
|
457
|
$ 519
|
|
| Defined Benefit Plan, Actuarial Net (Gains) Losses |
181
|
(106)
|
|
|
| Defined Benefit Plan, Benefit Obligation, Benefits Paid |
1,772
|
1,900
|
|
|
| Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant |
0
|
0
|
|
|
| Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) |
0
|
0
|
|
|
| Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) |
0
|
0
|
|
|
| Defined Benefit Plan, Plan Assets, Contributions by Employer |
1,772
|
1,900
|
|
|
| Defined Benefit Plan, Plan Assets, Contributions by Plan Participant |
0
|
0
|
|
|
| Defined Benefit Plan, Plan Assets, Benefits Paid |
1,772
|
1,900
|
|
|
| Defined Benefit Plan, Funded (Unfunded) Status of Plan |
$ (11,368)
|
$ (12,551)
|
|
|