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EMPLOYEE BENEFIT PLANS (Tables) | 6 Months Ended
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Sep. 30, 2016
Compensation And Retirement Disclosure [Abstract] |
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 September 30, 2016 and March 31, 2016:
|  | September 30, |  | March 31,
(In thousands) |  | 2016 |  | 2016
Investments held in Rabbi Trust |  | $ | 8,896 |  |  |  |  | 8,811 |  |
Unrealized losses in fair value of trust assets |  |  | 72 |  |  |  |  | (208 | ) |
Unrealized losses in fair value of trust assets are net of income tax expense of |  |  | — |  |  |  |  | (168 | ) |
Obligations under the supplemental plan |  |  | 25,739 |  |  |  |  | 25,072 |  |
Schedule of Net Periodic Benefit Cost | The net periodic benefit cost for the company’s defined benefit pension plans and 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 |  |  | Six Months Ended |
|  | September 30, |  |  | September 30, |
(In thousands) |  | 2016 |  |  | 2015 |  |  | 2016 |  |  | 2015 |
Pension Benefits: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 254 |  |  |  | 234 |  |  |  | 506 |  |  |  | 468 |
Interest cost |  |  | 941 |  |  |  | 935 |  |  |  | 1,882 |  |  |  | 1,870 |
Expected return on plan assets |  |  | (548 | ) |  |  | (530 | ) |  |  | (1,097 | ) |  |  | (1,060 | )
Administrative expenses |  |  | 2 |  |  |  | — |  |  |  | 4 |  |  |  | — |
Amortization of prior service cost |  |  | — |  |  |  | 9 |  |  |  | — |  |  |  | 18 |
Recognized actuarial loss |  |  | 446 |  |  |  | 567 |  |  |  | 892 |  |  |  | 1,134 |
Net periodic benefit cost |  | $ | 1,095 |  |  |  | 1,215 |  |  |  | 2,187 |  |  |  | 2,430 |
Other Benefits: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 20 |  |  |  | 75 |  |  |  | 40 |  |  |  | 150 |
Interest cost |  |  | 50 |  |  |  | 211 |  |  |  | 100 |  |  |  | 421 |
Amortization of prior service cost |  |  | (1,086 | ) |  |  | (510 | ) |  |  | (2,172 | ) |  |  | (1,021 | )
Recognized actuarial benefit |  |  | (285 | ) |  |  | (245 | ) |  |  | (570 | ) |  |  | (489 | )
Net periodic benefit cost |  | $ | (1,301 | ) |  |  | (469 | ) |  |  | (2,602 | ) |  |  | (939 | )

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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=65897934&loc=d3e1928-114920 + Details
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