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Schedule of Fair Values of Defined Benefit Plans Determined Using Fair Value Hierarchy of Inputs (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of defined benefit plans | $ 21,424 | $ 22,055 | $ 21,189
Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of defined benefit plans | 14,083 | 13,510 |
Fixed Income Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of defined benefit plans | 7,047 | 7,985 |
Real Estate Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of defined benefit plans | 129 | 133 |
Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of defined benefit plans | 115 | 303 |
Commodity Linked Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of defined benefit plans | 50 | 124 |
Fair Value, Inputs, Level 1 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of defined benefit plans | 115 | 303 |
Fair Value, Inputs, Level 1 | Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of defined benefit plans | 115 | 303 |
Fair Value, Inputs, Level 2 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of defined benefit plans | 21,309 | 21,752 |
Fair Value, Inputs, Level 2 | Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of defined benefit plans | 14,083 | 13,510 |
Fair Value, Inputs, Level 2 | Fixed Income Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of defined benefit plans | 7,047 | 7,985 |
Fair Value, Inputs, Level 2 | Real Estate Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of defined benefit plans | 129 | 133 |
Fair Value, Inputs, Level 2 | Commodity Linked Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair values of defined benefit plans | $ 50 | $ 124 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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