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Schedule of Carrying Value of Trust Assets, Including Unrealized Gains or Losses (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Mar. 31, 2014
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Defined Benefit Plan Disclosure [Line Items] |  |
Investments held in Rabbi Trust | $ 10,284 | $ 10,285
Unrealized gains in fair value of trust assets | 225 | 92
Unrealized gains in fair value of trust assets are net of income tax expense of | 121 | 49
Obligations under the supplemental plan | $ 22,789 | $ 21,918

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 + Details
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