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Summary of Pension Plan Investments Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
--- | --- | --- | ---
United States Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total Fair Value Measurement | $ 10,334 |  | $ 9,192 |  | $ 8,746
United States Plans | Quoted Price in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total Fair Value Measurement | 10,334 |  | 9,192 |  |
United States Plans | Cash and Cash Equivalents |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total Fair Value Measurement | 1,454 |  | 868 |  |
United States Plans | Cash and Cash Equivalents | Quoted Price in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total Fair Value Measurement | 1,454 |  | 868 |  |
United States Plans | US |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total Fair Value Measurement | 5,346 | [1] | 5,067 | [1] |
United States Plans | US | Quoted Price in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total Fair Value Measurement | 5,346 | [1] | 5,067 | [1] |
United States Plans | International Equity Securities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total Fair Value Measurement | 905 | [2] | 837 | [2] |
United States Plans | International Equity Securities | Quoted Price in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total Fair Value Measurement | 905 | [2] | 837 | [2] |
United States Plans | Fixed Income Funds |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total Fair Value Measurement | 2,629 | [3] | 2,420 | [3] |
United States Plans | Fixed Income Funds | Quoted Price in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total Fair Value Measurement | 2,629 | [3] | 2,420 | [3] |
International Plans |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total Fair Value Measurement | 29,468 |  | 26,942 |  | 25,779
International Plans | Quoted Price in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total Fair Value Measurement | 29,468 |  | 26,942 |  |
International Plans | US |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total Fair Value Measurement | 2,856 | [1] | 2,742 | [1] |
International Plans | US | Quoted Price in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total Fair Value Measurement | 2,856 | [1] | 2,742 | [1] |
International Plans | International Equity Securities |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total Fair Value Measurement | 15,617 | [2] | 14,728 | [2] |
International Plans | International Equity Securities | Quoted Price in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total Fair Value Measurement | 15,617 | [2] | 14,728 | [2] |
International Plans | Fixed Income Funds |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total Fair Value Measurement | 10,995 | [3] | 9,472 | [3] |
International Plans | Fixed Income Funds | Quoted Price in Active Markets for Identical Assets (Level 1) |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Total Fair Value Measurement | $ 10,995 | [3] | $ 9,472 | [3] |
[1] | US equities include companies that are well diversified by industry sector and equity style (i.e., growth and value strategies). Active and passive management strategies are employed. Investments are primarily in large capitalization stocks and, to a lesser extent, mid- and small-cap stocks.
[2] | International equities are invested in companies that are traded on exchanges outside the U.S. and are well diversified by industry sector, country and equity style. Active and passive strategies are employed. The vast majority of the investments are made in companies in developed markets with a small percentage in emerging markets.
[3] | Fixed income consists primarily of investment grade bonds from diversified industries.

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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 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: 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=21915506&loc=d3e1928-114920 + Details
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