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Schedule of Asset Allocation (Detail) | 12 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015
U.S. Pension Plans, Defined Benefit |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 100.00% |
Actual asset allocations | 100.00% | 100.00%
U.S. Pension Plans, Defined Benefit | Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 100.00% |
Actual asset allocations | 95.00% | 95.00%
U.S. Pension Plans, Defined Benefit | Cash And Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual asset allocations | 5.00% | 5.00%
Supplemental Executive Retirement Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 100.00% |
Actual asset allocations | 100.00% | 100.00%
Supplemental Executive Retirement Plan | Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 65.00% |
Actual asset allocations | 58.00% | 58.00%
Supplemental Executive Retirement Plan | Debt Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target asset allocation | 35.00% |
Actual asset allocations | 39.00% | 39.00%
Supplemental Executive Retirement Plan | Cash And Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Actual asset allocations | 3.00% | 3.00%

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