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Employee Benefit Plans (Table Text Block) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2016
Disclosure Text Block Supplement [Abstract] |  |
Net period benefit and postretirement costs |
|  | Quarter Ended December 31,
|  | 2016 |  | 2015
|  | (Unaudited)
|  | (In thousands)
Service cost for benefits earned during the period | $ | 256 | $ | 240
Interest cost on accumulated postretirement benefit |  | 204 |  | 188
Other components |  | 22 |  | 9
Net periodic postretirement benefit cost | $ | 482 | $ | 437
|  | Nine Months Ended December 31,
|  | 2016 |  | 2015
|  | (Unaudited)
|  | (In thousands)
Service cost for benefits earned during the period | $ | 769 | $ | 720
Interest cost on accumulated postretirement benefit |  | 611 |  | 564
Other components |  | 66 |  | 27
Net periodic postretirement benefit cost | $ | 1,446 | $ | 1,311

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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + 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=58740216&loc=d3e1928-114920 + Details
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