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Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Mar. 31, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total fair value of plan assets | $ 9,775 | $ 9,915
Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 9,960 | 10,038
Other pending transactions | (185) | (123)
Total fair value of plan assets | 9,775 | 9,915
Common stock | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 3,825 | 3,859
Foreign Stock | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 210 | 201
American Depository Receipts | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 1,642 | 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 | 14 | 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 | 57 | 59
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 | 1,915 | 1,926
Open Ended Mutual Funds | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 1,915 | 1,916
Cash and Cash Equivalents | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 382 | 377
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 | 9,056 | 9,184
Other pending transactions | (185) | (123)
Total fair value of plan assets | 8,871 | 9,061
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 | 3,825 | 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 | 210 | 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 | 1,642 | 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 | 14 | 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 | 57 | 59
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 | 1,360 | 1,377
Quoted Prices In Active Markets (Level 1) | Open Ended Mutual Funds | Supplemental Executive Retirement Plan |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Fair value of plan assets | 1,915 | 1,916
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 | 33 | 72
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 | 904 | 854
Total fair value of plan assets | 904 | 854
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 | 555 | 549
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 | $ 349 | $ 305

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