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Employee Benefit Plans (Table Text Block) | 6 Months Ended
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Sep. 30, 2017
Disclosure Text Block Supplement [Abstract] |
Net period benefit and postretirement costs |
|  | Quarter Ended September 30,
|  | 2017 |  | 2016
|  | (Unaudited)
|  | (In thousands)
Service cost for benefits earned during the period | $ | 268 | $ | 257
Interest cost on accumulated postretirement benefit |  | 217 |  | 203
Other components |  | 15 |  | 22
Net periodic postretirement benefit cost | $ | 500 | $ | 482
|  | Six Months Ended September 30,
|  | 2017 |  | 2016
|  | (Unaudited)
|  | (In thousands)
Service cost for benefits earned during the period | $ | 536 | $ | 513
Interest cost on accumulated postretirement benefit |  | 434 |  | 407
Other components |  | 30 |  | 44
Net periodic postretirement benefit cost | $ | 1,000 | $ | 964

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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=82843861&loc=d3e1928-114920 + Details
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