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Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets	$ (56,896)	$ (59,431)
Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets	56,002	58,524
Accrued income	894	907
Total fair value of plan assets	56,896	59,431
Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets	10,375	10,635
Other pending transactions	(90)	(149)
Total fair value of plan assets	10,285	10,486
US Government Agencies Debt Securities | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets	2,935	3,142
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	1,975	2,007
Corporate Debt Securities | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets	50,113	53,352
Foreign Debt Securities | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets	1,443	1,416
Cash and Cash Equivalents | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets	1,511	614
Cash and Cash Equivalents | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets	369	533
Common Stock | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets	4,141	4,240
Foreign Stock | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets	231	285
American Depository Receipts | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets	1,809	1,811
Preferred American Depository Receipts | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets	15	16
Real Estate Investment Trusts | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets	38
Open Ended Mutual Funds | Supplemental Executive Retirement Plan
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets	1,797	1,743
Quoted Prices In Active Markets (Level 1) | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets	2,935	3,142
Accrued income	894	907
Total fair value of plan assets	3,829	4,049
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	9,451	9,428
Other pending transactions	(90)	(149)
Total fair value of plan assets	9,361	9,279
Quoted Prices In Active Markets (Level 1) | US Government Agencies Debt Securities | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets	2,935	3,142
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	1,363	1,240
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	57	93
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	4,141	4,240
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	231	285
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	1,809	1,811
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	15	16
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	38
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	1,797	1,743
Significant Observable Inputs (Level 2) | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets	53,067	55,382
Total fair value of plan assets	53,067	55,382
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	924	1,207
Total fair value of plan assets	924	1,207
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	612	767
Significant Observable Inputs (Level 2) | Corporate Debt Securities | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets	50,113	53,352
Significant Observable Inputs (Level 2) | Foreign Debt Securities | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets	1,443	1,416
Significant Observable Inputs (Level 2) | Cash and Cash Equivalents | Pension Plans, Defined Benefit
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Fair value of plan assets	1,511	614
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	$ 312	$ 440

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Defined Benefit Plan, Accrued Income

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- Definition

Defined benefit plan fair value of plan assets total gross.

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- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ 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 (b)

-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 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930

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