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Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fair value of plan assets | $ 8,697 | $ 8,811
Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 8,738 | 8,551
Other pending transactions | (40) | 260
Total fair value of plan assets | 8,698 | 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 | 1,677 | 1,711
Other pending transactions |  | 18
Total fair value of plan assets | 1,677 | 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 | 6,079 | 5,819
Other pending transactions | (40) | 291
Total fair value of plan assets | 6,039 | 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 | 982 | 1,021
Other pending transactions |  | (49)
Total fair value of plan assets | 982 | 972
Supplemental Executive Retirement Plan | Equity Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 5,164 | 4,834
Supplemental Executive Retirement Plan | Equity 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 | 5,164 | 4,834
Supplemental Executive Retirement Plan | Debt Securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 3,207 | 3,374
Supplemental Executive Retirement Plan | Debt Securities | Measured At Net Asset Value |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 1,622 | 1,663
Supplemental Executive Retirement Plan | 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 | 860 | 972
Supplemental Executive Retirement Plan | 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 | 725 | 739
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 | 367 | 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 | 55 | 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 | 55 | 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 | $ 257 | $ 282

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