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Pension And Other Postretirement Benefit Plans (Tables) | 6 Months Ended
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Sep. 30, 2013
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) |  | 2013 |  | 2012 |  | 2013 |  | 2012
Service cost |  | $ | 1,197 |  |  | $ | 1,046 |  |  | $ | 131 |  |  | $ | 146 |
Interest cost |  | 2,865 |  |  | 3,153 |  |  | 508 |  |  | 569 |
Expected return on plan assets |  | (3,543 | ) |  | (3,197 | ) |  | (30 | ) |  | (31 | )
Settlement costs |  | — |  |  | 1,329 |  |  | — |  |  | — |
Net amortization and deferral |  | 2,447 |  |  | 2,846 |  |  | (17 | ) |  | 48 |
Net periodic benefit cost |  | $ | 2,966 |  |  | $ | 5,177 |  |  | $ | 592 |  |  | $ | 732 |
|  | Pension Benefits |  | Other Postretirement Benefits
|  | Six Months Ended September 30, |  | Six Months Ended September 30,
(in thousands of dollars) |  | 2013 |  | 2012 |  | 2013 |  | 2012
Service cost |  | $ | 2,392 |  |  | $ | 2,270 |  |  | $ | 269 |  |  | $ | 294 |
Interest cost |  | 5,722 |  |  | 6,319 |  |  | 1,040 |  |  | 1,145 |
Expected return on plan assets |  | (7,085 | ) |  | (6,694 | ) |  | (60 | ) |  | (62 | )
Settlement costs |  | — |  |  | 1,329 |  |  | — |  |  | — |
Net amortization and deferral |  | 4,894 |  |  | 5,364 |  |  | (34 | ) |  | 100 |
Net periodic benefit cost |  | $ | 5,923 |  |  | $ | 8,588 |  |  | $ | 1,215 |  |  | $ | 1,477 |
Projected benefit obligation and funded status of the Company's defined benefit pension plans after remeasurement |
|  | Pension Benefits
(in thousands of dollars) |  | September 30, 2013 |  | March 31, 2013
Projected benefit obligation |  | $ | 260,689 |  |  | $ | 299,161 |
Funded status |  | (52,484 | ) |  | (93,219 | )

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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 1 -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 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=28361610&loc=d3e2417-114920 Reference 3: 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=32704760&loc=d3e4179-114921 Reference 4: 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=28361610&loc=d3e2439-114920 Reference 5: 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=28361610&loc=d3e2410-114920 + Details
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- Definition Tabular disclosure of net funded status of pension plans and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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