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Significant Assumptions of Domestic and Overseas Pension Plans Used to Determine Plan Amounts (Detail) | 12 Months Ended
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Mar. 31, 2011 | Mar. 31, 2010 | Mar. 31, 2009
Domestic Pension Plans Of Foreign Entity Defined Benefit |  |  |
Weighted-average assumptions used to determine benefit obligations at March 31: |  |  |
Discount rate | 2.10% | 2.10% | 1.90%
Rate of increase in compensation levels | 6.10% | 5.90% | 5.80%
Weighted-average assumptions used to determine net periodic pension cost for years ended March 31: |  |  |
Discount rate | 2.10% | 1.90% | 2.20%
Rate of increase in compensation levels | 5.90% | 5.80% | 6.20%
Expected long-term rate of return on plan assets | 2.20% | 2.20% | 2.20%
Foreign Pension Plans Defined Benefit |  |  |
Weighted-average assumptions used to determine benefit obligations at March 31: |  |  |
Discount rate | 5.50% | 6.00% | 7.10%
Rate of increase in compensation levels | 0.80% | 0.80% | 0.60%
Weighted-average assumptions used to determine net periodic pension cost for years ended March 31: |  |  |
Discount rate | 6.00% | 7.10% | 6.50%
Rate of increase in compensation levels | 0.80% | 0.60% | 0.70%
Expected long-term rate of return on plan assets | 8.10% | 8.10% | 8.20%

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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j + Details
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- Definition The interest rate used to adjust for the time value of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j + 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 Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j + Details
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