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Employee Benefit Plans (Tables) | 9 Months Ended
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Dec. 31, 2014
Schedule of Carrying Value of Trust Assets, Including Unrealized Gains or Losses | The following table summarizes the carrying value of the trust assets, including unrealized gains or losses at December 31, 2014 and March 31, 2014:
|  | December 31, |  | March 31, |  |  |
(In thousands) |  | 2014 |  |  |  |  | 2014 |  |  |
Investments held in Rabbi Trust |  | $ | 10,023 |  |  |  |  |  | 10,285 |  |  |
Unrealized gains in fair value of trust assets |  |  | 263 |  |  |  |  |  | 92 |  |  |
Unrealized gains in fair value of trust assets are net of income tax expense of |  |  | 92 |  |  |  |  |  | 49 |  |  |
Obligations under the supplemental plan |  |  | 23,229 |  |  |  |  |  | 21,918 |  |  |
Schedule of Net Periodic Benefit Cost | The net periodic benefit cost for the company’s U.S. defined benefit pension plan and the supplemental plan (referred to collectively as “Pension Benefits”) and the postretirement health care and life insurance plan (referred to collectively as “Other Benefits”) is comprised of the following components:
|  | Quarter Ended December 31, |  |  |  | Nine Months Ended December 31, |  |
(In thousands) |  | 2014 |  | 2013 |  |  |  | 2014 |  | 2013 |  |
Pension Benefits: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  |  | $ | 206 |  |  |  |  | 198 |  |  |  |  |  |  |  |  |  | 618 |  |  |  |  | 594 |  |  |  |  |  |
Interest cost |  |  |  | 968 |  |  |  |  | 895 |  |  |  |  |  |  |  |  |  | 2,904 |  |  |  |  | 2,685 |  |  |  |  |  |
Expected return on plan assets |  |  |  | (685 | ) |  |  |  | (718 | ) |  |  |  |  |  |  |  |  | (2,055 | ) |  |  |  | (2,154 | ) |  |  |  |  |
Amortization of prior service cost |  |  |  | 12 |  |  |  |  | 12 |  |  |  |  |  |  |  |  |  | 36 |  |  |  |  | 36 |  |  |  |  |  |
Recognized actuarial loss |  |  |  | 247 |  |  |  |  | 276 |  |  |  |  |  |  |  |  |  | 741 |  |  |  |  | 828 |  |  |  |  |  |
Net periodic benefit cost |  |  | $ | 748 |  |  |  |  | 663 |  |  |  |  |  |  |  |  |  | 2,244 |  |  |  |  | 1,989 |  |  |  |  |  |
Other Benefits: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  |  | $ | 68 |  |  |  |  | 101 |  |  |  |  |  |  |  |  |  | 204 |  |  |  |  | 303 |  |  |  |  |  |
Interest cost |  |  |  | 226 |  |  |  |  | 262 |  |  |  |  |  |  |  |  |  | 678 |  |  |  |  | 786 |  |  |  |  |  |
Amortization of prior service cost |  |  |  | (508 | ) |  |  |  | (508 | ) |  |  |  |  |  |  |  |  | (1,524 | ) |  |  |  | (1,524 | ) |  |  |  |  |
Recognized actuarial (gain) loss |  |  |  | (325 | ) |  |  |  | (99 | ) |  |  |  |  |  |  |  |  | (975 | ) |  |  |  | (297 | ) |  |  |  |  |
Net periodic benefit cost |  |  | $ | (539 | ) |  |  |  | (244 | ) |  |  |  |  |  |  |  |  | (1,617 | ) |  |  |  | (732 | ) |  |  |  |  |

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- Definition Schedule of Carrying Value of Trust Assets Including Unrealized Gains or Losses. + References No definition available. + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + 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 (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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