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Employee Benefit Plans - Summary of Weighted Average Asset Allocation of Plan Assets by Asset Category (Detail) | 12 Months Ended |
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Mar. 31, 2016 | Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |
Target Plan Asset Allocations | 100.00% | 100.00%
Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Plan Asset Allocations Range Minimum | 50.00% |
Target Plan Asset Allocations Range Maximum | 70.00% |
Target Plan Asset Allocations | 67.00% | 66.00%
Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Plan Asset Allocations Range Minimum | 20.00% |
Target Plan Asset Allocations Range Maximum | 50.00% |
Target Plan Asset Allocations | 33.00% | 34.00%

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