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Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Mar. 31, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | $ 57,174 | $ 59,485
Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 56,352 | 58,619
Accrued income | 822 | 866
Total fair value of plan assets | 57,174 | 59,485
Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 8,551 | 10,038
Other pending transactions | 260 | (123)
Total fair value of plan assets | 8,811 | 9,915
US Government Agencies Debt Securities | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 3,104 | 3,116
US Government Agencies Debt Securities | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 1,711 | 1,926
Collateralized mortgage securities | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 47 | 400
Corporate Debt Securities | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 48,378 | 51,758
Foreign Debt Securities | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 1,499 | 1,529
Cash and Cash Equivalents | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 2,247 | 1,816
Cash and Cash Equivalents | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 343 | 377
Common stock | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 3,290 | 3,859
Foreign Stock | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 159 | 201
American Depository Receipts | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 1,311 | 1,685
Preferred American Depository Receipts | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 13 | 15
Real Estate Investment Trusts | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 61 | 59
Open Ended Mutual Funds | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 1,663 | 1,916
Other | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 1,077 |
Quoted Prices In Active Markets (Level 1) | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 3,514 | 3,116
Accrued income | 822 | 866
Total fair value of plan assets | 4,336 | 3,982
Quoted Prices In Active Markets (Level 1) | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 5,819 | 7,268
Other pending transactions | 291 | (123)
Total fair value of plan assets | 6,110 | 7,145
Quoted Prices In Active Markets (Level 1) | US Government Agencies Debt Securities | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 3,104 | 3,116
Quoted Prices In Active Markets (Level 1) | US Government Agencies Debt Securities | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 972 | 1,377
Quoted Prices In Active Markets (Level 1) | Cash and Cash Equivalents | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 346 |
Quoted Prices In Active Markets (Level 1) | Cash and Cash Equivalents | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 13 | 72
Quoted Prices In Active Markets (Level 1) | Common stock | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 3,290 | 3,859
Quoted Prices In Active Markets (Level 1) | Foreign Stock | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 159 | 201
Quoted Prices In Active Markets (Level 1) | American Depository Receipts | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 1,311 | 1,685
Quoted Prices In Active Markets (Level 1) | Preferred American Depository Receipts | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 13 | 15
Quoted Prices In Active Markets (Level 1) | Real Estate Investment Trusts | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 61 | 59
Quoted Prices In Active Markets (Level 1) | Other | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 64 |
Significant Observable Inputs (Level 2) | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 52,838 | 55,503
Total fair value of plan assets | 52,838 | 55,503
Significant Observable Inputs (Level 2) | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 1,021 | 810
Other pending transactions | (49) |
Total fair value of plan assets | 972 | 810
Significant Observable Inputs (Level 2) | US Government Agencies Debt Securities | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 739 | 549
Significant Observable Inputs (Level 2) | Collateralized mortgage securities | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 47 | 400
Significant Observable Inputs (Level 2) | Corporate Debt Securities | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 48,378 | 51,758
Significant Observable Inputs (Level 2) | Foreign Debt Securities | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 1,499 | 1,529
Significant Observable Inputs (Level 2) | Cash and Cash Equivalents | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 1,901 | 1,816
Significant Observable Inputs (Level 2) | Cash and Cash Equivalents | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 282 | 261
Significant Observable Inputs (Level 2) | Other | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 1,013 |
Measured At Net Asset Value | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 1,711 | 1,960
Other pending transactions | 18 |
Total fair value of plan assets | 1,729 | 1,960
Measured At Net Asset Value | Cash and Cash Equivalents | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 48 | 44
Measured At Net Asset Value | Open Ended Mutual Funds | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | $ 1,663 | $ 1,916

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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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