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Summary of Minimum And Maximum Rate of Return of Plan Assets (Detail) - Supplemental Executive Retirement Plan | 12 Months Ended
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Mar. 31, 2016
Minimum | Equity Securities |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |
Expected Rate of Return on Plan Assets | 5.00%
Minimum | Debt Securities |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |
Expected Rate of Return on Plan Assets | 1.00%
Minimum | Cash and Cash Equivalents |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |
Expected Rate of Return on Plan Assets | 0.00%
Maximum | Equity Securities |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |
Expected Rate of Return on Plan Assets | 7.00%
Maximum | Debt Securities |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |
Expected Rate of Return on Plan Assets | 3.00%
Maximum | Cash and Cash Equivalents |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |
Expected Rate of Return on Plan Assets | 1.00%

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- Definition Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] + References No definition available. + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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