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Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Mar. 31, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fair value of plan assets | $ 9,072 | $ 9,915
Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 9,267 | 10,038
Other pending transactions | (195) | (123)
Total fair value of plan assets | 9,072 | 9,915
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 | 8,137 | 9,184
Other pending transactions | (195) | (123)
Total fair value of plan assets | 7,942 | 9,061
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 | 1,130 | 854
Total fair value of plan assets | 1,130 | 854
Supplemental Executive Retirement Plan | Common stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 3,497 | 3,859
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 | 3,497 | 3,859
Supplemental Executive Retirement Plan | Foreign Stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair value of plan assets | 258 | 201
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 | 258 | 201
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 | 1,529 | 1,685
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 | 1,529 | 1,685
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 | 15 | 15
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 | 15 | 15
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 | 74 | 59
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 | 74 | 59
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 | 1,818 | 1,926
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 | 1,028 | 1,377
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 | 790 | 549
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 | 1,770 | 1,916
Supplemental Executive Retirement Plan | Open Ended Mutual Funds | 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 | 1,770 | 1,916
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 | 306 | 377
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 | (34) | 72
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 | $ 340 | $ 305

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