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Schedule of Carrying Value of Trust Assets, Including Unrealized Gains or Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Mar. 31, 2015
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Compensation And Retirement Disclosure [Abstract] |  |
Investments held in Rabbi Trust | $ 9,072 | $ 9,915
Unrealized gains (losses) in fair value of trust assets | 233 | 235
Obligations under the supplemental plan | $ 27,143 | $ 25,510

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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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