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Pension And Other Postretirement Benefit Plans (Tables) | 6 Months Ended
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Sep. 30, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [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) |  | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost |  | $ | 1,479 |  |  | $ | 1,327 |  |  | $ | 106 |  |  | $ | 114 |
Interest cost |  | 2,347 |  |  | 2,656 |  |  | 392 |  |  | 481 |
Expected return on plan assets |  | (3,577 | ) |  | (3,535 | ) |  | (15 | ) |  | (26 | )
Curtailment gain |  | — |  |  | — |  |  | — |  |  | (1,503 | )
Net amortization and deferral |  | 1,199 |  |  | 780 |  |  | (44 | ) |  | (133 | )
Net periodic benefit cost |  | $ | 1,448 |  |  | $ | 1,228 |  |  | $ | 439 |  |  | $ | (1,067 | )
|  | Pension Benefits |  | Other Postretirement Benefits
|  | Six Months Ended September 30, |  | Six Months Ended September 30,
(in thousands of dollars) |  | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost |  | $ | 2,962 |  |  | $ | 2,661 |  |  | $ | 214 |  |  | $ | 228 |
Interest cost |  | 4,693 |  |  | 5,325 |  |  | 799 |  |  | 965 |
Expected return on plan assets |  | (7,153 | ) |  | (7,227 | ) |  | (30 | ) |  | (52 | )
Curtailment gain |  | — |  |  | — |  |  | — |  |  | (1,503 | )
Net amortization and deferral |  | 2,398 |  |  | 1,560 |  |  | (88 | ) |  | (266 | )
Net periodic benefit cost |  | $ | 2,900 |  |  | $ | 2,319 |  |  | $ | 895 |  |  | $ | (628 | )

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=58242635&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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