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Schedule of Asset Allocation (Detail)	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	100.00%
Actual asset allocations	100.00%	100.00%
Pension Plans, Defined Benefit | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	100.00%
Actual asset allocations	96.00%	98.00%
Pension Plans, Defined Benefit | Cash And Other
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocations	4.00%	2.00%
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	60.00%	60.00%
Supplemental Executive Retirement Plan | Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Target asset allocation	35.00%
Actual asset allocations	37.00%	35.00%
Supplemental Executive Retirement Plan | Cash And Other
Defined Benefit Plan Disclosure [Line Items]
Actual asset allocations	3.00%	5.00%

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X

- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(i)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e2446-114920



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920

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