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Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Mar. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fair value of plan assets | $ 8,896 | $ 8,811
Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 8,821 | 8,551
Other pending transactions | 75 | 260
Total fair value of plan assets | 8,896 | 8,811
Supplemental Executive Retirement Plan | Measured At Net Asset Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 1,697 | 1,711
Other pending transactions |  | 18
Total fair value of plan assets | 1,697 | 1,729
Supplemental Executive Retirement Plan | Quoted Prices In Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 6,027 | 5,819
Other pending transactions | 75 | 291
Total fair value of plan assets | 6,102 | 6,110
Supplemental Executive Retirement Plan | Significant Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 1,097 | 1,021
Other pending transactions |  | (49)
Total fair value of plan assets | 1,097 | 972
Supplemental Executive Retirement Plan | Common stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 3,631 | 3,290
Supplemental Executive Retirement Plan | Common stock | Quoted Prices In Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 3,631 | 3,290
Supplemental Executive Retirement Plan | Foreign Stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 133 | 159
Supplemental Executive Retirement Plan | Foreign Stock | Quoted Prices In Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 133 | 159
Supplemental Executive Retirement Plan | American Depository Receipts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 1,345 | 1,311
Supplemental Executive Retirement Plan | American Depository Receipts | Quoted Prices In Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 1,345 | 1,311
Supplemental Executive Retirement Plan | Preferred American Depository Receipts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 18 | 13
Supplemental Executive Retirement Plan | Preferred American Depository Receipts | Quoted Prices In Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 18 | 13
Supplemental Executive Retirement Plan | Real Estate Investment Trusts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 21 | 61
Supplemental Executive Retirement Plan | Real Estate Investment Trusts | Quoted Prices In Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 21 | 61
Supplemental Executive Retirement Plan | Government Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 1,597 | 1,711
Supplemental Executive Retirement Plan | Government Debt Securities | Quoted Prices In Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 826 | 972
Supplemental Executive Retirement Plan | Government Debt Securities | Significant Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 771 | 739
Supplemental Executive Retirement Plan | Open Ended Mutual Funds |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 1,682 | 1,663
Supplemental Executive Retirement Plan | Open Ended Mutual Funds | Measured At Net Asset Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 1,682 | 1,663
Supplemental Executive Retirement Plan | Cash and Cash Equivalents |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 394 | 343
Supplemental Executive Retirement Plan | Cash and Cash Equivalents | Measured At Net Asset Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 15 | 48
Supplemental Executive Retirement Plan | Cash and Cash Equivalents | Quoted Prices In Active Markets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 53 | 13
Supplemental Executive Retirement Plan | Cash and Cash Equivalents | Significant Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | $ 326 | $ 282

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