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Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2017 | Mar. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | $ 57,146 | $ 57,174
Total fair value of plan assets | 8,759 | 8,811
Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 56,465 | 56,352
Accrued income | 681 | 822
Total fair value of plan assets | 57,146 | 57,174
Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 8,760 | 8,551
Other pending transactions |  | 260
Total fair value of plan assets | 8,760 | 8,811
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 | 1,720 | 1,711
Other pending transactions |  | 18
Total fair value of plan assets | 1,720 | 1,729
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 | 3,770 | 3,104
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 | 1,613 | 1,711
Collateralized mortgage securities | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 2,537 | 47
Corporate Debt Securities | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 47,871 | 48,378
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
Cash and Cash Equivalents | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 989 | 2,247
Cash and Cash Equivalents | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 323 | 343
Cash and Cash Equivalents | 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 | 72 | 48
Common stock | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 3,561 | 3,290
Foreign Stock | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 132 | 159
American Depository Receipts | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 1,387 | 1,311
Preferred American Depository Receipts | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 20 | 13
Real Estate Investment Trusts | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 76 | 61
Open Ended Mutual Funds | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 1,648 | 1,663
Open Ended Mutual Funds | 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 | 1,648 | 1,663
Other | Pension Plans, Defined Benefit |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 1,298 | 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 | 4,215 | 3,514
Accrued income | 681 | 822
Total fair value of plan assets | 4,896 | 4,336
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 | 6,023 | 5,819
Other pending transactions |  | 291
Total fair value of plan assets | 6,023 | 6,110
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 | 3,770 | 3,104
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 | 832 | 972
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 | 345 | 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 | 15 | 13
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 | 3,561 | 3,290
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 | 132 | 159
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 | 1,387 | 1,311
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 | 20 | 13
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 | 76 | 61
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 | 100 | 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 | 52,250 | 52,838
Total fair value of plan assets | 52,250 | 52,838
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 | 1,017 | 1,021
Other pending transactions |  | (49)
Total fair value of plan assets | 1,017 | 972
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 | 781 | 739
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 | 2,537 | 47
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 | 47,871 | 48,378
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
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 | 644 | 1,901
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 | 236 | 282
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 | $ 1,198 | $ 1,013

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