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Schedule of Carrying Value of Trust Assets, Including Unrealized Gains or Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Mar. 31, 2016
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Compensation And Retirement Disclosure [Abstract] |  |
Investments held in Rabbi trust | $ 8,697 | $ 8,811
Unrealized losses in fair value of trust assets | (1) | (208)
Unrealized losses in fair value of trust assets are net of income tax expense of |  | (168)
Obligations under the supplemental plan | $ 26,043 | $ 25,072

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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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