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Pension And Other Postretirement Benefit Plans (Tables) | 6 Months Ended
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Sep. 30, 2018
Defined Benefit Plan [Abstract] |
Components of Company's Net Periodic Benefit Cost | The components of the Company’s net periodic benefit cost were as follows:
|  | Pension Benefits |  | Other Postretirement Benefits
|  | Three Months Ended September 30, |  | Three Months Ended September 30,
(in thousands of dollars) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost |  | $ | 1,452 |  |  | $ | 1,318 |  |  | $ | 58 |  |  | $ | 65 |
Interest cost |  | 2,485 |  |  | 2,439 |  |  | 330 |  |  | 386 |
Expected return on plan assets |  | (3,694 | ) |  | (3,717 | ) |  | (25 | ) |  | (22 | )
Net amortization and deferral |  | 902 |  |  | 815 |  |  | (194 | ) |  | (71 | )
Net periodic benefit cost |  | $ | 1,145 |  |  | $ | 855 |  |  | $ | 169 |  |  | $ | 358 |
|  | Pension Benefits |  | Other Postretirement Benefits
|  | Six Months Ended September 30, |  | Six Months Ended September 30,
(in thousands of dollars) |  | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost |  | $ | 2,907 |  |  | $ | 2,629 |  |  | $ | 117 |  |  | $ | 129 |
Interest cost |  | 4,966 |  |  | 4,873 |  |  | 670 |  |  | 769 |
Expected return on plan assets |  | (7,388 | ) |  | (7,434 | ) |  | (50 | ) |  | (44 | )
Net amortization and deferral |  | 1,804 |  |  | 1,630 |  |  | (388 | ) |  | (142 | )
Net periodic benefit cost |  | $ | 2,289 |  |  | $ | 1,698 |  |  | $ | 349 |  |  | $ | 712 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2417-114920 + Details
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