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Components of Net Periodic Cost (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Compensation And Retirement Disclosure [Abstract] |  |  |  |
Service Cost - Benefits Earned During the Period | $ 100 | $ 153 | $ 200 | $ 404
Interest Cost of Projected Benefit Obligation | 337 | 357 | 674 | 753
Expected Return on Plan Assets | (463) | (578) | (926) | (980)
Recognized Net Actuarial Loss | 58 | 46 | 116 | 473
Amortization of Prior-Service Cost | 15 | 60 | 30 | 150
Net Periodic Pension Cost | $ 47 | $ 38 | $ 94 | $ 800

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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